The investment seeks investment results, before fees and expenses, that track the performance of the FTSE RAFITM US 1000 Long/Short Total Return Index (the index). The fund invests in financial instruments that ProShare Advisors believes, in combination, should track the performance of the index. The index allocates an aggregate equal dollar amount to both long and short equity positions each time that the index rebalances. To be long means to hold or have long exposure to an asset with the expectation that its value will increase over time. The fund is non-diversified.