The Stanhope Semi-Flex® Performance Foundation is a steel wire foundation that is superior to all-wood alternatives because it is stronger and lasts longer. The foundation provides consistent support across the bottom of the mattress and lasting durability to the mattress sleep set. Built with high quality materials including Sustainable Forest Lumber and Stanhope Branded Corner Guards. The Foundation helps to absorb the impact of your partner’s movement so you can sleep undisturbed.