The investment seeks daily investment results, before fees and expenses, that correspond to two times the inverse (-2x) of the daily performance of the Dow Jones U.S. Health CareSM Index. The fund invests in derivatives that ProShare Advisors believes, in combination, should have similar daily return characteristics as two times the inverse (-2x) of the daily return of the index. The index measures the performance of the healthcare sector of the U.S. equity market. Component companies include, among others, health care providers, biotechnology companies, medical supplies, advanced medical devices and pharmaceuticals. The fund is non-diversified.