497

Investment Managers Series Trust II

235 W. Galena Street

Milwaukee, Wisconsin 53212

May 23, 2018

VIA EDGAR TRANSMISSION

U.S. Securities and Exchange Commission

Division of Investment Management

100 “F” Street, N.E.

Washington, DC 20549

Re: Investment Managers Series Trust II (the “Trust”)

File Nos. 333-191476 and 811-22894 on behalf

of All Terrain Opportunity Fund

Ladies and gentlemen:

On behalf of the Fund, we are filing today through EDGAR, pursuant to the requirements of Rule 497(e) under the Securities Act of 1933, as amended (the “Securities Act”), XBRL interactive data files relating to revised Investments and Risks summary (Item 3 to Form N1-A) in the Prospectus for the Fund, which were filed electronically with the Securities and Exchange Commission pursuant to Rule 497(e) under the Securities Act on April 6, 2018 (Accession No. 0001398344-18-005304). The purpose of this filing is to submit an XBRL interactive data file in the manner provided by Rule 405 of Regulation S-T and General Instruction C.3.(g) of Form N-1A.

If you have any questions or require further information, do not hesitate to contact the undersigned at (626) 914-1360.

Sincerely,

/s/ JOY AUSILI

Joy Ausili

Investment Managers Series Trust II

XML

All Terrain Opportunity Fund

SUMMARY SECTION

Investment Objective

The investment objective of the All Terrain Opportunity Fund (the "Fund") is to seek capital appreciation with positive returns in all market conditions.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder Fees
(fees paid directly from your investment)

Shareholder Fees	All Terrain Opportunity Fund Institutional Class USD ($)
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	none
Maximum deferred sales charge (load) (as a percentage of the lesser of the value redeemed or the amount invested)	none
Redemption fee if redeemed within 60 days of purchase (as a percentage of amount redeemed)	1.00%
Wire fee	$ 20
Overnight check delivery fee	25
Retirement account fees (annual maintenance fee)	$ 15

Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses	All Terrain Opportunity Fund Institutional Class	[1]
Management fees	1.40%
Distribution and service (Rule 12b-1) fees	none
Shareholder service fee	0.06%
All other expenses	0.83%
Other expenses	0.89%
Acquired fund fees and expenses	0.52%
Total annual fund operating expenses	2.81%	[2]
Fees waived and/or expenses reimbursed	(0.69%)	[3]
Total annual fund operating expenses after waiving fees and/or reimbursing expenses	2.12%	[2],[3]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example	One Year	Three Years	Five Years	Ten Years
All Terrain Opportunity Fund | Institutional Class | USD ($)	215	806	1,423	3,088

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 280% of the average value of its portfolio.

Principal Investment Strategies

The Fund seeks to participate in gains in the U.S. and foreign markets in all market conditions and will attempt to minimize the impact of market losses during periods of extreme market stress. The Fund will make investments that the Fund's advisors believe offer a high probability of return, or, alternatively, a high degree of safety during uncertain market conditions. These investments include domestic and foreign equity securities of companies with market capitalizations over $200 million, and fixed income securities of domestic and foreign issuers (including emerging market companies) of any credit quality (including junk bonds) and duration, including U.S. Treasury securities, corporate bonds and other fixed income securities. The Fund may be long or short in these securities by taking positions in individual securities, individual stock options, index options, financial futures, exchange-traded funds ("ETFs"), inverse ETFs, currencies, or other investment companies. Fixed income investments, other than U.S. Treasury securities, will generally be made through ETFs or other registered investment companies. The Fund may, from time to time, invest a significant portion of its assets in a single ETF or other registered investment company. The Fund may invest up to 50% of its assets in short sales or one or more inverse ETFs during adverse market conditions.

The Fund is managed by Castle Financial & Retirement Planning Associates, Inc. ("Castle Financial"), and Bauer Capital Management, LLC ("Bauer Capital"), who serve as co-investment advisors and construct the Fund's portfolio (collectively referred to as the "Advisors"). The Advisors work collaboratively to make investment decisions for the Fund, although each Advisor may make an investment decision independently when necessary if the other Advisor is not available. The Advisors will tactically allocate the Fund's assets among securities using both fundamental and technical analysis to evaluate the relative strengths of and trends in the Fund's potential portfolio investments. Generally, Castle Financial provides fundamental analysis and Bauer Capital provides technical analysis. Castle Financial uses a fundamental methodology to screen for securities for the portfolio focusing on the overall earning potential of a company issuing stock, which may include analysis of financial statements, management, competitors, intangible values and product markets, among other factors. Bauer Capital uses a quantitative methodology to screen for securities for the portfolio focusing on financial valuation metrics such as ratios of price to free cash flow, price to operating income, earnings before interest and tax ("EBIT"), to enterprise value and other financial metrics. Bauer Capital also evaluates potential securities using technical analysis including momentum, trading volumes, option flows, seasonality and proprietary technical indicators. The Advisors may from time to time focus on companies involved in corporate events such as spin-offs, share buybacks and public records of securities purchases and sales by corporate directors and officers.

The Fund has no set holding period for any security and actively trades its portfolio investments, which may result in a high portfolio turnover rate. Securities are sold (or purchased back in the case of securities sold short) when they no longer meet the Advisors' target risk return profile. The Advisors attempt to control risk through various techniques including scaling in or out of positions, using position limits and using stop orders.

Principal Risks of Investing

Risk is inherent in all investing and you could lose money by investing in the Fund. A summary description of certain principal risks of investing in the Fund is set forth below. Before you decide whether to invest in the Fund, carefully consider these risk factors associated with investing in the Fund, which may cause investors to lose money. There can be no assurance that the Fund will achieve its investment objective.

Credit Risk. If an issuer or guarantor of a debt security held directly or indirectly by the Fund or a counterparty to a financial contract with the Fund defaults or is downgraded or is perceived to be less creditworthy, or if the value of the assets underlying a security declines, the value of the Fund's portfolio will typically decline.

Emerging Market Risk. Many of the risks with respect to foreign investments are more pronounced for investments in issuers in developing or emerging market countries. Emerging market countries tend to have more government exchange controls, more volatile interest and currency exchange rates, less market regulation, and less developed economic, political and legal systems than those of more developed countries. In addition, emerging market countries may experience high levels of inflation and may have less liquid securities markets and less efficient trading and settlement systems.

Equity Risk. The value of the equity securities held by the Fund may fall due to general market and economic conditions, perceptions regarding the industries in which the issuers of securities held by the Fund participate, or factors relating to specific companies in which the Fund invests.

ETF Risk. Investing in an ETF will provide the Fund with exposure to the securities comprising the index on which the ETF is based and will expose the Fund to risks similar to those of investing directly in those securities. Shares of ETFs typically trade on securities exchanges and may at times trade at a premium or discount to their net asset values. In addition, an ETF may not replicate exactly the performance of the benchmark index it seeks to track for a number of reasons, including transaction costs incurred by the ETF, the temporary unavailability of certain index securities in the secondary market or discrepancies between the ETF and the index with respect to the weighting of securities or the number of securities held. Investing in ETFs, which are investment companies, involves duplication of advisory fees and certain other expenses. The Fund will pay brokerage commissions in connection with the purchase and sale of shares of ETFs.

Event-Driven Risk. The Advisors' evaluation of the outcome of a proposed corporate event, whether it be a merger, reorganization, regulatory issue or other event, may prove incorrect and the Fund's return on the investment may be negative. Even if the Advisors' judgment regarding the likelihood of a specific outcome proves correct, the expected event may be delayed or completed on terms other than those originally proposed, which may cause the Fund to lose money or fail to achieve a desired rate of return.

Fixed Income Securities Risk. The prices of fixed income securities respond to economic developments, particularly interest rate changes, as well as to changes in an issuer's credit rating or market perceptions about the creditworthiness of an issuer. Generally fixed income securities decrease in value if interest rates rise and increase in value if interest rates fall, and longer-term and lower rated securities are more volatile than shorter-term and higher rated securities.

Foreign Investment Risk. The prices of foreign securities may be more volatile than the prices of securities of U.S. issuers because of economic and social conditions abroad, political developments, and changes in the regulatory environments of foreign countries. In addition, changes in exchange rates and interest rates may adversely affect the values of the Fund's foreign investments. Foreign companies are generally subject to different legal and accounting standards than U.S. companies, and foreign financial intermediaries may be subject to less supervision and regulation than U.S. financial firms. Foreign securities include American Depository Receipts ("ADRs") and Global Depository Receipts ("GDRs"). Unsponsored ADRs and GDRs are organized independently and without the cooperation of the foreign issuer of the underlying securities, and involve additional risks because U.S. reporting requirements do not apply. In addition, the issuing bank may deduct shareholder distribution, custody, foreign currency exchange, and other fees from the payment of dividends.

Futures Risk. The value of a futures contract tends to increase and decrease in correlation with the value of the underlying instrument. Risks of futures contracts may arise from an imperfect correlation between movements in the price of the futures and the price of the underlying instrument. The Fund's use of futures contracts (and related options) exposes the Fund to leverage risk because of the small margin requirements relative to the value of the futures contract. A relatively small market movement will have a proportionately larger impact on the funds that the Fund has deposited or will have to deposit with a broker to maintain its futures position. Leverage can lead to large losses as well as gains. While futures contracts are generally liquid instruments, under certain market conditions they may become illiquid. Futures exchanges may impose daily or intraday price change limits and/or limit the volume of trading. Additionally, government regulation may further reduce liquidity through similar trading restrictions. As a result, the Fund may be unable to close out its futures contracts at a time that is advantageous. The price of futures can be highly volatile; using them could lower total return, and the potential loss from futures could exceed the Fund's initial investment in such contracts.

High Yield ("Junk") Bond Risk. High yield bonds are debt securities rated below investment grade (often called "junk bonds"). Junk bonds are speculative, involve greater risks of default, downgrade, or price declines and are more volatile and tend to be less liquid than investment-grade securities. Companies issuing high yield bonds are less financially strong, are more likely to encounter financial difficulties, and are more vulnerable to adverse market events and negative sentiments than companies with higher credit ratings.

Interest Rate Risk. Generally fixed income securities decrease in value if interest rates rise and increase in value if interest rates fall, with longer-term securities being more sensitive than shorter-term securities. For example, the price of a security with a three-year duration would be expected to drop by approximately 3% in response to a 1% increase in interest rates. Generally, the longer the maturity and duration of a bond or fixed rate loan, the more sensitive it is to this risk. Falling interest rates also create the potential for a decline in the Fund's income. Changes in governmental policy, rising inflation rates, and general economic developments, among other factors, could cause interest rates to increase and could have a substantial and immediate effect on the values of the Fund's investments. In addition, a potential rise in interest rates may result in periods of volatility and increased redemptions that might require the Fund to liquidate portfolio securities at disadvantageous prices and times.

Inverse ETF Risk. Inverse ETFs are ETFs that are constructed by using various derivatives for the purpose of profiting from a decline in the value of an underlying benchmark. Investments in inverse ETFs will prevent the Fund from participating in market-wide or sector-wide gains and may not prove to be an effective hedge. Unlike traditional funds, shareholders of inverse ETFs will lose money when the underlying benchmark rises. During periods of increased volatility, inverse ETFs may not perform in the manner they are designed. Due to volatility and the effects of compounding, inverse ETFs can lose money even if the level of the index falls.

Management and Strategy Risk. The value of your investment depends on the judgment of the 'Fund's advisor about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, which may prove to be incorrect.

Market Risk. The market price of a security or instrument may decline, sometimes rapidly or unpredictably, due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic or political conditions throughout the world, changes in the general outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. The market value of a security or instrument also may decline because of factors that affect a particular industry or industries, such as labor shortages or increased production costs and competitive conditions within an industry.

Options Risk. Purchasing and writing put and call options are highly specialized activities and entail greater than ordinary investment risks. The Fund may not fully benefit from or may lose money on an option if changes in its value do not correspond as anticipated to changes in the value of the underlying securities. If the Fund is not able to sell an option held in its portfolio, it would have to exercise the option to realize any profit and would incur transaction costs upon the purchase or sale of the underlying securities. Ownership of options involves the payment of premiums, which may adversely affect the Fund's performance. To the extent that the Fund invests in over-the-counter options, the Fund may be exposed to counterparty risk.

Portfolio Turnover Risk. Active and frequent trading of the Fund's portfolio securities may lead to higher transaction costs and may result in a greater number of taxable transactions than would otherwise be the case, which could negatively affect the Fund's performance. A high rate of portfolio turnover is 100% or more.

Short Sales Risk. In connection with a short sale of a security or other instrument, the Fund is subject to the risk that instead of declining, the price of the security or other instrument sold short will rise. If the price of the security or other instrument sold short increases between the date of the short sale and the date on which the Fund replaces the security or other instrument borrowed to make the short sale, the Fund will experience a loss, which is theoretically unlimited since there is a theoretically unlimited potential for the market price of a security or other instrument sold short to increase. Shorting options or futures may have an imperfect correlation to the assets held by the Fund and may not adequately protect against losses in or may result in greater losses for the Fund's portfolio.

Small-Cap and Mid-Cap Company Risk. The securities of small-capitalization and mid-capitalization companies may be subject to more abrupt or erratic market movements and may have lower trading volumes or more erratic trading than securities of larger, more established companies or market averages in general. In addition, such companies typically are more likely to be adversely affected than large capitalization companies by changes in earning results, business prospects, investor expectations or poor economic or market conditions.

Underlying Fund Risk. Other registered investment companies including mutual funds, ETFs and closed-end funds ("Underlying Funds") in which the Fund invests are subject to investment advisory and other expenses, which will be indirectly paid by the Fund. As a result, the cost of investing in the Fund will be higher than the cost of investing directly in the Underlying Funds and may be higher than other mutual funds that invest directly in stocks and bonds. Each of the Underlying Funds is subject to its own specific risks, but the Advisors expect the principal investments risks of such Underlying Funds will be similar to the risks of investing in the Fund.

Performance

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the average annual total returns of the Fund compare with the average annual total returns of a broad-based market index. Updated performance information is available at the Fund's website, www.allterrainfunds.com, or by calling the Fund at 1-844-441-4440. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Prior to September 16, 2016, the Fund was subject to a distribution fee pursuant to a Rule 12b-1 Plan. The distribution fee is reflected in the Fund's performance for periods prior to September 16, 2016.

Calendar-Year Total Return (before taxes) for Institutional Class Shares

For each calendar year at NAV

Institutional Class Shares
Highest Calendar Quarter Return at NAV	2.61%	Quarter Ended 03/31/2017
Lowest Calendar Quarter Return at NAV	(3.02)%	Quarter Ended 09/30/2015

Average Annual Total Returns for Period Ended December 31, 2017

Average Annual Total Returns - All Terrain Opportunity Fund		1 Year	Since Inception	Inception Date
Institutional Class		8.83%	3.33%	Nov. 03, 2014
Institutional Class | After Taxes on Distributions	[1]	7.91%	2.47%	Nov. 03, 2014
Institutional Class | After Taxes on Distributions and Sales	[1]	5.09%	2.19%	Nov. 03, 2014
HFRX Global Hedge Fund Index (reflects no deduction for fees, expenses or taxes)		5.99%	1.35%	Nov. 03, 2014

[1] The expense information in the table has been restated to reflect the current management fee and expense limitation agreement, which both became effective May 1, 2017.

[2] The total annual fund operating expenses and net operating expenses after fee waiver and/or expense reimbursements do not correlate to the ratio of expenses to average net assets appearing in the financial highlights table, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.

[3] Castle Financial & Retirement Planning Associates, Inc. ("Castle Financial") and Bauer Capital Management, LLC ("Bauer Capital"), the Fund's advisors (collectively referred to as the "Advisors"), have contractually agreed to waive fees and/or pay for operating expenses of the Fund to ensure that total annual fund operating expenses (excluding any taxes, leverage interest, brokerage commissions, dividend and interest expenses on short sales, acquired fund fees and expenses (as determined in accordance with SEC Form N-1A), expenses incurred in connection with any merger or reorganization, and extraordinary expenses such as litigation expenses) do not exceed 1.60% of the average daily net assets of Institutional Class shares of the Fund. This agreement is in effect until February 28, 2019, and may be terminated before that date only by the Trust's Board of Trustees. Any reduction in advisory fees or payment of the Fund's expenses made by Castle Financial or Bauer Capital is not subject to reimbursement by the Fund.

[1] After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. Prior to September 16, 2016, Institutional Class Shares were subject to a 5.75% sales charge which is not reflected in the total return figures.

XML

Label

Element

Value

Risk Return Abstract

rr_RiskReturnAbstract

Document Type

dei_DocumentType

497

Document Period End Date

dei_DocumentPeriodEndDate

Oct. 31, 2017

Registrant Name

dei_EntityRegistrantName

Investment Managers Series Trust II

Central Index Key

dei_EntityCentralIndexKey

0001587982

Amendment Flag

dei_AmendmentFlag

false

Document Creation Date

dei_DocumentCreationDate

Apr. 06, 2018

Document Effective Date

dei_DocumentEffectiveDate

Apr. 06, 2018

Prospectus Date

rr_ProspectusDate

Mar. 01, 2018

All Terrain Opportunity Fund

Risk Return Abstract

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

SUMMARY SECTION

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The investment objective of the All Terrain Opportunity Fund (the "Fund") is to seek capital appreciation with positive returns in all market conditions.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees
(fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

February 28, 2019

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 280% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

280.00%

Expenses Restated to Reflect Current [Text]

rr_ExpensesRestatedToReflectCurrent

The expense information in the table has been restated to reflect the current management fee and expense limitation agreement, which both became effective May 1, 2017.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

The total annual fund operating expenses and net operating expenses after fee waiver and/or expense reimbursements do not correlate to the ratio of expenses to average net assets appearing in the financial highlights table, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund seeks to participate in gains in the U.S. and foreign markets in all market conditions and will attempt to minimize the impact of market losses during periods of extreme market stress. The Fund will make investments that the Fund's advisors believe offer a high probability of return, or, alternatively, a high degree of safety during uncertain market conditions. These investments include domestic and foreign equity securities of companies with market capitalizations over $200 million, and fixed income securities of domestic and foreign issuers (including emerging market companies) of any credit quality (including junk bonds) and duration, including U.S. Treasury securities, corporate bonds and other fixed income securities. The Fund may be long or short in these securities by taking positions in individual securities, individual stock options, index options, financial futures, exchange-traded funds ("ETFs"), inverse ETFs, currencies, or other investment companies. Fixed income investments, other than U.S. Treasury securities, will generally be made through ETFs or other registered investment companies. The Fund may, from time to time, invest a significant portion of its assets in a single ETF or other registered investment company. The Fund may invest up to 50% of its assets in short sales or one or more inverse ETFs during adverse market conditions.

The Fund is managed by Castle Financial & Retirement Planning Associates, Inc. ("Castle Financial"), and Bauer Capital Management, LLC ("Bauer Capital"), who serve as co-investment advisors and construct the Fund's portfolio (collectively referred to as the "Advisors"). The Advisors work collaboratively to make investment decisions for the Fund, although each Advisor may make an investment decision independently when necessary if the other Advisor is not available. The Advisors will tactically allocate the Fund's assets among securities using both fundamental and technical analysis to evaluate the relative strengths of and trends in the Fund's potential portfolio investments. Generally, Castle Financial provides fundamental analysis and Bauer Capital provides technical analysis. Castle Financial uses a fundamental methodology to screen for securities for the portfolio focusing on the overall earning potential of a company issuing stock, which may include analysis of financial statements, management, competitors, intangible values and product markets, among other factors. Bauer Capital uses a quantitative methodology to screen for securities for the portfolio focusing on financial valuation metrics such as ratios of price to free cash flow, price to operating income, earnings before interest and tax ("EBIT"), to enterprise value and other financial metrics. Bauer Capital also evaluates potential securities using technical analysis including momentum, trading volumes, option flows, seasonality and proprietary technical indicators. The Advisors may from time to time focus on companies involved in corporate events such as spin-offs, share buybacks and public records of securities purchases and sales by corporate directors and officers.

The Fund has no set holding period for any security and actively trades its portfolio investments, which may result in a high portfolio turnover rate. Securities are sold (or purchased back in the case of securities sold short) when they no longer meet the Advisors' target risk return profile. The Advisors attempt to control risk through various techniques including scaling in or out of positions, using position limits and using stop orders.

Risk [Heading]

rr_RiskHeading

Principal Risks of Investing

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Risk is inherent in all investing and you could lose money by investing in the Fund. A summary description of certain principal risks of investing in the Fund is set forth below. Before you decide whether to invest in the Fund, carefully consider these risk factors associated with investing in the Fund, which may cause investors to lose money. There can be no assurance that the Fund will achieve its investment objective.

Credit Risk. If an issuer or guarantor of a debt security held directly or indirectly by the Fund or a counterparty to a financial contract with the Fund defaults or is downgraded or is perceived to be less creditworthy, or if the value of the assets underlying a security declines, the value of the Fund's portfolio will typically decline.

Emerging Market Risk. Many of the risks with respect to foreign investments are more pronounced for investments in issuers in developing or emerging market countries. Emerging market countries tend to have more government exchange controls, more volatile interest and currency exchange rates, less market regulation, and less developed economic, political and legal systems than those of more developed countries. In addition, emerging market countries may experience high levels of inflation and may have less liquid securities markets and less efficient trading and settlement systems.

Equity Risk. The value of the equity securities held by the Fund may fall due to general market and economic conditions, perceptions regarding the industries in which the issuers of securities held by the Fund participate, or factors relating to specific companies in which the Fund invests.

ETF Risk. Investing in an ETF will provide the Fund with exposure to the securities comprising the index on which the ETF is based and will expose the Fund to risks similar to those of investing directly in those securities. Shares of ETFs typically trade on securities exchanges and may at times trade at a premium or discount to their net asset values. In addition, an ETF may not replicate exactly the performance of the benchmark index it seeks to track for a number of reasons, including transaction costs incurred by the ETF, the temporary unavailability of certain index securities in the secondary market or discrepancies between the ETF and the index with respect to the weighting of securities or the number of securities held. Investing in ETFs, which are investment companies, involves duplication of advisory fees and certain other expenses. The Fund will pay brokerage commissions in connection with the purchase and sale of shares of ETFs.

Event-Driven Risk. The Advisors' evaluation of the outcome of a proposed corporate event, whether it be a merger, reorganization, regulatory issue or other event, may prove incorrect and the Fund's return on the investment may be negative. Even if the Advisors' judgment regarding the likelihood of a specific outcome proves correct, the expected event may be delayed or completed on terms other than those originally proposed, which may cause the Fund to lose money or fail to achieve a desired rate of return.

Fixed Income Securities Risk. The prices of fixed income securities respond to economic developments, particularly interest rate changes, as well as to changes in an issuer's credit rating or market perceptions about the creditworthiness of an issuer. Generally fixed income securities decrease in value if interest rates rise and increase in value if interest rates fall, and longer-term and lower rated securities are more volatile than shorter-term and higher rated securities.

Foreign Investment Risk. The prices of foreign securities may be more volatile than the prices of securities of U.S. issuers because of economic and social conditions abroad, political developments, and changes in the regulatory environments of foreign countries. In addition, changes in exchange rates and interest rates may adversely affect the values of the Fund's foreign investments. Foreign companies are generally subject to different legal and accounting standards than U.S. companies, and foreign financial intermediaries may be subject to less supervision and regulation than U.S. financial firms. Foreign securities include American Depository Receipts ("ADRs") and Global Depository Receipts ("GDRs"). Unsponsored ADRs and GDRs are organized independently and without the cooperation of the foreign issuer of the underlying securities, and involve additional risks because U.S. reporting requirements do not apply. In addition, the issuing bank may deduct shareholder distribution, custody, foreign currency exchange, and other fees from the payment of dividends.

Futures Risk. The value of a futures contract tends to increase and decrease in correlation with the value of the underlying instrument. Risks of futures contracts may arise from an imperfect correlation between movements in the price of the futures and the price of the underlying instrument. The Fund's use of futures contracts (and related options) exposes the Fund to leverage risk because of the small margin requirements relative to the value of the futures contract. A relatively small market movement will have a proportionately larger impact on the funds that the Fund has deposited or will have to deposit with a broker to maintain its futures position. Leverage can lead to large losses as well as gains. While futures contracts are generally liquid instruments, under certain market conditions they may become illiquid. Futures exchanges may impose daily or intraday price change limits and/or limit the volume of trading. Additionally, government regulation may further reduce liquidity through similar trading restrictions. As a result, the Fund may be unable to close out its futures contracts at a time that is advantageous. The price of futures can be highly volatile; using them could lower total return, and the potential loss from futures could exceed the Fund's initial investment in such contracts.

High Yield ("Junk") Bond Risk. High yield bonds are debt securities rated below investment grade (often called "junk bonds"). Junk bonds are speculative, involve greater risks of default, downgrade, or price declines and are more volatile and tend to be less liquid than investment-grade securities. Companies issuing high yield bonds are less financially strong, are more likely to encounter financial difficulties, and are more vulnerable to adverse market events and negative sentiments than companies with higher credit ratings.

Interest Rate Risk. Generally fixed income securities decrease in value if interest rates rise and increase in value if interest rates fall, with longer-term securities being more sensitive than shorter-term securities. For example, the price of a security with a three-year duration would be expected to drop by approximately 3% in response to a 1% increase in interest rates. Generally, the longer the maturity and duration of a bond or fixed rate loan, the more sensitive it is to this risk. Falling interest rates also create the potential for a decline in the Fund's income. Changes in governmental policy, rising inflation rates, and general economic developments, among other factors, could cause interest rates to increase and could have a substantial and immediate effect on the values of the Fund's investments. In addition, a potential rise in interest rates may result in periods of volatility and increased redemptions that might require the Fund to liquidate portfolio securities at disadvantageous prices and times.

Inverse ETF Risk. Inverse ETFs are ETFs that are constructed by using various derivatives for the purpose of profiting from a decline in the value of an underlying benchmark. Investments in inverse ETFs will prevent the Fund from participating in market-wide or sector-wide gains and may not prove to be an effective hedge. Unlike traditional funds, shareholders of inverse ETFs will lose money when the underlying benchmark rises. During periods of increased volatility, inverse ETFs may not perform in the manner they are designed. Due to volatility and the effects of compounding, inverse ETFs can lose money even if the level of the index falls.

Management and Strategy Risk. The value of your investment depends on the judgment of the 'Fund's advisor about the quality, relative yield, value or market trends affecting a particular security, industry, sector or region, which may prove to be incorrect.

Market Risk. The market price of a security or instrument may decline, sometimes rapidly or unpredictably, due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic or political conditions throughout the world, changes in the general outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. The market value of a security or instrument also may decline because of factors that affect a particular industry or industries, such as labor shortages or increased production costs and competitive conditions within an industry.

Options Risk. Purchasing and writing put and call options are highly specialized activities and entail greater than ordinary investment risks. The Fund may not fully benefit from or may lose money on an option if changes in its value do not correspond as anticipated to changes in the value of the underlying securities. If the Fund is not able to sell an option held in its portfolio, it would have to exercise the option to realize any profit and would incur transaction costs upon the purchase or sale of the underlying securities. Ownership of options involves the payment of premiums, which may adversely affect the Fund's performance. To the extent that the Fund invests in over-the-counter options, the Fund may be exposed to counterparty risk.

Portfolio Turnover Risk. Active and frequent trading of the Fund's portfolio securities may lead to higher transaction costs and may result in a greater number of taxable transactions than would otherwise be the case, which could negatively affect the Fund's performance. A high rate of portfolio turnover is 100% or more.

Short Sales Risk. In connection with a short sale of a security or other instrument, the Fund is subject to the risk that instead of declining, the price of the security or other instrument sold short will rise. If the price of the security or other instrument sold short increases between the date of the short sale and the date on which the Fund replaces the security or other instrument borrowed to make the short sale, the Fund will experience a loss, which is theoretically unlimited since there is a theoretically unlimited potential for the market price of a security or other instrument sold short to increase. Shorting options or futures may have an imperfect correlation to the assets held by the Fund and may not adequately protect against losses in or may result in greater losses for the Fund's portfolio.

Small-Cap and Mid-Cap Company Risk. The securities of small-capitalization and mid-capitalization companies may be subject to more abrupt or erratic market movements and may have lower trading volumes or more erratic trading than securities of larger, more established companies or market averages in general. In addition, such companies typically are more likely to be adversely affected than large capitalization companies by changes in earning results, business prospects, investor expectations or poor economic or market conditions.

Underlying Fund Risk. Other registered investment companies including mutual funds, ETFs and closed-end funds ("Underlying Funds") in which the Fund invests are subject to investment advisory and other expenses, which will be indirectly paid by the Fund. As a result, the cost of investing in the Fund will be higher than the cost of investing directly in the Underlying Funds and may be higher than other mutual funds that invest directly in stocks and bonds. Each of the Underlying Funds is subject to its own specific risks, but the Advisors expect the principal investments risks of such Underlying Funds will be similar to the risks of investing in the Fund.

Risk Lose Money [Text]

rr_RiskLoseMoney

Before you decide whether to invest in the Fund, carefully consider these risk factors associated with investing in the Fund, which may cause investors to lose money.

Bar Chart and Performance Table [Heading]

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Performance

Performance Narrative [Text Block]

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The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the average annual total returns of the Fund compare with the average annual total returns of a broad-based market index. Updated performance information is available at the Fund's website, www.allterrainfunds.com, or by calling the Fund at 1-844-441-4440. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. Prior to September 16, 2016, the Fund was subject to a distribution fee pursuant to a Rule 12b-1 Plan. The distribution fee is reflected in the Fund's performance for periods prior to September 16, 2016.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the average annual total returns of the Fund compare with the average annual total returns of a broad-based market index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

1-844-441-4440

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.allterrainfunds.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.

Bar Chart [Heading]

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Calendar-Year Total Return (before taxes) for Institutional Class Shares

For each calendar year at NAV

Bar Chart Closing [Text Block]

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Institutional Class Shares
Highest Calendar Quarter Return at NAV	2.61%	Quarter Ended 03/31/2017
Lowest Calendar Quarter Return at NAV	(3.02)%	Quarter Ended 09/30/2015

Performance Table Heading

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Average Annual Total Returns for Period Ended December 31, 2017

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

All Terrain Opportunity Fund | Institutional Class

Risk Return Abstract

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Trading Symbol

dei_TradingSymbol

TERIX

Maximum sales charge (load) imposed on purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) (as a percentage of the lesser of the value redeemed or the amount invested)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Redemption fee if redeemed within 60 days of purchase (as a percentage of amount redeemed)

rr_RedemptionFeeOverRedemption

(1.00%)

Wire fee

imst2_Allterrain_WireFee

$ 20

Overnight check delivery fee

imst2_Allterrain_OvernightCheckDeliveryFee

25

Retirement account fees (annual maintenance fee)

rr_ShareholderFeeOther

$ 15

Management fees

rr_ManagementFeesOverAssets

1.40%

^[1]

Distribution and service (Rule 12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

^[1]

Shareholder service fee

rr_Component1OtherExpensesOverAssets

0.06%

^[1]

All other expenses

rr_Component2OtherExpensesOverAssets

0.83%

^[1]

Other expenses

rr_OtherExpensesOverAssets

0.89%

^[1]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.52%

^[1]

Total annual fund operating expenses

rr_ExpensesOverAssets

2.81%

^[1],[2]

Fees waived and/or expenses reimbursed

rr_FeeWaiverOrReimbursementOverAssets

(0.69%)

^[1],[3]

Total annual fund operating expenses after waiving fees and/or reimbursing expenses

rr_NetExpensesOverAssets

2.12%

^[1],[2],[3]

One Year

rr_ExpenseExampleYear01

$ 215

Three Years

rr_ExpenseExampleYear03

806

Five Years

rr_ExpenseExampleYear05

1,423

Ten Years

rr_ExpenseExampleYear10

$ 3,088

Annual Return 2015

rr_AnnualReturn2015

(2.51%)

Annual Return 2016

rr_AnnualReturn2016

3.63%

Annual Return 2017

rr_AnnualReturn2017

8.83%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Calendar Quarter Return at NAV

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2017

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

2.61%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Calendar Quarter Return at NAV

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2015

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(3.02%)

1 Year

rr_AverageAnnualReturnYear01

8.83%

Since Inception

rr_AverageAnnualReturnSinceInception

3.33%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 03, 2014

All Terrain Opportunity Fund | After Taxes on Distributions | Institutional Class

Risk Return Abstract

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

7.91%

^[4]

Since Inception

rr_AverageAnnualReturnSinceInception

2.47%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 03, 2014

^[4]

All Terrain Opportunity Fund | After Taxes on Distributions and Sales | Institutional Class

Risk Return Abstract

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.09%

^[4]

Since Inception

rr_AverageAnnualReturnSinceInception

2.19%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 03, 2014

^[4]

All Terrain Opportunity Fund | HFRX Global Hedge Fund Index (reflects no deduction for fees, expenses or taxes)

Risk Return Abstract

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.99%

Since Inception

rr_AverageAnnualReturnSinceInception

1.35%

Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 03, 2014

[1] The expense information in the table has been restated to reflect the current management fee and expense limitation agreement, which both became effective May 1, 2017.

[2] The total annual fund operating expenses and net operating expenses after fee waiver and/or expense reimbursements do not correlate to the ratio of expenses to average net assets appearing in the financial highlights table, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.

[3] Castle Financial & Retirement Planning Associates, Inc. ("Castle Financial") and Bauer Capital Management, LLC ("Bauer Capital"), the Fund's advisors (collectively referred to as the "Advisors"), have contractually agreed to waive fees and/or pay for operating expenses of the Fund to ensure that total annual fund operating expenses (excluding any taxes, leverage interest, brokerage commissions, dividend and interest expenses on short sales, acquired fund fees and expenses (as determined in accordance with SEC Form N-1A), expenses incurred in connection with any merger or reorganization, and extraordinary expenses such as litigation expenses) do not exceed 1.60% of the average daily net assets of Institutional Class shares of the Fund. This agreement is in effect until February 28, 2019, and may be terminated before that date only by the Trust's Board of Trustees. Any reduction in advisory fees or payment of the Fund's expenses made by Castle Financial or Bauer Capital is not subject to reimbursement by the Fund.

[4] After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. Prior to September 16, 2016, Institutional Class Shares were subject to a 5.75% sales charge which is not reflected in the total return figures.