The investment seeks daily investment results, before fees and expenses, of 100% of the inverse (or opposite) of the daily performance of the ICE U.S. Treasury 20+ Year Bond Index. The fund, under normal circumstances, invests in swap agreements, futures contracts, short positions or other financial instruments that, in combination, provide inverse (opposite) or short exposure to the index equal to at least 80% of the fund's net assets (plus borrowing for investment purposes). The index is a market value weighted index that includes publicly issued U.S. Treasury securities that have a remaining maturity of greater than 20 years. The fund is non-diversified.