The investment seeks to replicate, net of expenses, the inverse of the daily performance of the S&P 500 VIX Mid-Term Futures index. The index was designed to provide investors with exposure to one or more maturities of futures contracts on the VIX, which reflects implied volatility of the S&P 500 Index at various points along the volatility forward curve. The calculation of the VIX is based on prices of put and call options on the S&P 500 Index. The ETNs are linked to the daily inverse return of the index and do not represent an investment in the inverse of the VIX.