The investment seeks to track the performance of an index that measures the performance of U.S. large- and mid-capitalization stocks exhibiting relatively higher momentum characteristics, before fees and expenses. The fund generally invests at least 90% of its assets in the securities of the underlying index or in depositary receipts representing securities in its underlying index. The MSCI USA Momentum Index (the "underlying index") consists of stocks exhibiting relatively higher momentum characteristics than the traditional market capitalization-weighted parent index, the MSCI USA Index, which includes U.S. large- and mid-capitalization stocks.