The investment seeks to track the investment results (before fees and expenses) of the ICE BofA 0-5 Year US Inflation-Linked Treasury IndexSM (the underlying index). The fund generally will invest at least 80% of its total assets in the securities that comprise the underlying index. The index is designed to measure the performance of the shorter maturity subset of the U.S. Treasury Inflation-Protected Securities (TIPS) market, represented by TIPS with a remaining maturity of at least one month and less than five years.