As the Federal Reserve contemplates a December interest rate hike, investors can turn to inverse Treasury bond exchange traded funds to lower a fixed-income portfolio’s overall duration and hedge against rising rates.

For example, the popular ProShares UltraShort 20+ Year Treasury (NYSEArca: TBT), which has $2.8 billion in assets under management, has been a go-to method for many traders to hedge against falling Treasury bond prices or rising yields – bond prices and yields have an inverse relationship, so rising yields correspond with falling prices.

TBT tries to reflect the inverse -2x or -200% daily performance of the U.S. Barclays U.S. 20+ Year Treasury Bond Index. The leveraged inverse ETF has a 94% correlation to the U.S. Treasury yields, reports Eric Balchunas for Bloomberg.

With the markets anticipating a December rate hike after the strong October jobs number, more investors may turn to TBT to help hedge a fixed-income portfolio against the negative effects of rising rates.

“We think TBT could be our best trade ever, when it occurs,” Sharon Snow, a portfolio manager at Metropolitan Capital Strategies, told Bloomberg. “It takes more than just one Fed fund rate raise to allow this trade to unfold. We are looking at a longer-term time frame when the U.S. economy really takes off, which means three quarters of GDP between 3.3 [percent and] 3.7 percent with an indication of multiple of interest rate increases.”

Along with a tactical bet on rising rates, TBT may be used to depress a bond portfolio’s overall duration – a bond fund’s measure of sensitivity to changes in interest rates. TBT shows a duration of -19 years, so a 1% rise in interest rates could cause the fund to gain roughly 19%. In contrast, the iShares 20+ Year Treasury Bond ETF (NYSEArca: TLT), which tries to reflect the simple long exposure of the Barclays U.S. 20+ Year Treasury Bond Index, has a positive 17.16 year duration, so a 1% rise in rates could mean a 17.16% price decline.