The investment seeks investment results that correspond generally to the price and yield performance, before fees and expenses, of the Barclays U.S. Short Treasury Bond Index (the "underlying index"). The fund generally invests at least 90% of its assets in the bonds of the underlying index and at least 95% of its assets in U.S. government bonds. The underlying index measures the performance of public obligations of the U.S. Treasury that have a remaining maturity of between one and 12 months.