TBT is the trader's fund of choice for levered bets on rising interest rates. Using a combination of swaps and futures, TBT gives investors -2x exposure to daily moves in T-bonds with more than 20 years left to maturity. This gives the fund a negative duration exceeding 30 years. The daily reset means investors shouldn't expect the leverage factor to hold constant over investment horizons greater than 1 day. In short, the fund is a valid option for tactical positioning/hedging against rising interest rates, but it's important to keep in mind that the -2x leverage results in greater impact from the effects of compounding. It trades briskly and block liquidity is excellent. TBT's fees are also low for this segment, making it a cost-effective option for getting inverse exposure to T-bonds.TBT changed its underlying index from Bloomberg Barclays U.S. 20+ Year Treasury Bond Index to ICE U.S. Treasury 20+ Year Bond Index on 10/14/2016. The change has minimal impact on investor’s exposure.