The ProShares UltraShort 20+ Year Treasury ETF offers leveraged inverse exposure to long-duration Treasuries, benefiting if long-term yields rise. TBT's daily-reset 2x structure introduces significant path dependency, making it unsuitable for long-term investors despite a reasonable bearish macro view on bonds. I rate TBT a Hold, as it is best used for short-term tactical trades or hedges, not as a core or buy-and-hold position.