UGL promises twice the daily returns of gold its a bullish bet on the price of gold. The funds leveraged exposure is benchmarked to the price performance of the Bloomberg Gold Subindex an index tracking a rolling futures position on gold based on Bloombergs fixed contract schedule. It's designed for short-term tactical use, so its not for buy-and-hold investors. If held for longer than one day, the effects of daily compounding can cause UGL to drift away from the promised 2x exposure. As an ETF, UGL is structured as a commodities pool, so expect a K-1 at tax time.