The investment seeks to track as closely as possible, before fees and expenses, the price and yield performance of the Barclays U.S. Treasury Inflation Protected Securities (TIPS) Index (Series L)SM. The fund invests at least 90% of its net assets in securities included in the index. The index includes all publicly-issued U.S. TIPS that have at least one year remaining to maturity, are rated investment grade and have $250 million or more of outstanding face value. The TIPS in the index must be denominated in U.S. dollars and must be fixed-rate and non-convertible.