The investment seeks to provide inflation protection and income by investing primarily in inflation protected debt securities. The fund invests, under normal circumstances, at least 80% of its investable assets in U.S. Treasury Inflation-Protected Securities ("TIPS"). In pursuit of this investment policy, the fund may invest a large percentage of its investable assets in securities held within the underlying index. It may also hold non inflation-indexed securities, although these will normally not exceed 20% of the fund's total assets. The investments may be public or private securities.