The investment seeks to mitigate the interest rate risk of a portfolio composed of U.S. dollar-denominated investment-grade corporate bonds with remaining maturities greater than ten years. The fund invests at least 80% of its net assets in U.S. dollar-denominated investment-grade corporate bonds with remaining maturities greater than ten years, in one or more underlying funds that principally invest in U.S. dollar-denominated investment-grade corporate bonds.