The investment seeks daily investment results, before fees and expenses, that correspond to the inverse (-1x) of the daily performance of the Dow Jones U.S. Real EstateSM Index. The fund invests in financial instruments that ProShare Advisors believes, in combination, should produce daily returns consistent with the fund's investment objective. The index measures the performance of certain companies in the real estate industry of the U.S. equity market. Component companies include, among others, real estate holding and development and real estate services companies and real estate investment trusts (REITs). The fund is non-diversified.