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 derivatives that ProShare Advisors believes, in combination, should have similar daily return characteristics as the inverse (-1x) of the daily return of the index. The index measures the performance of the real estate sector 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.