ProShares UltraShort Bloomberg Natural Gas -2x Shares 

The fund seeks to meet its investment objective by investing in Natural Gas futures contracts. It may also invest in swaps if the market for a specific futures contract experiences emergencies or disruptions (e.g., a trading halt or a flash crash) or in situations where the Sponsor deems it impractical or inadvisable to buy or sell futures contracts (such as during periods of market volatility or illiquidity).