This Koval Luxe Medium Firm Pillow Top Mattress Set by Stearns & Foster Estate collection is made of a Tencel fabric, fibers sustainably sourced, used in activewear, designed to wick away moisture and keep you comfortable, a PrimaSense™ foam that works in tandem with five and a half inches of Premium gel foam to deliver a superior feeling of well-being, a spring block (spring-in-a-spring) that provides even more adaptive support for any type of sleeper, an innovative firmer coil system that provides better support than a hardened foam surround and a vented coil system that expands combines with four external air vents to prevent heat build-up in your mattress set and promote deep, cool and comfortable sleep throughout the night. This mattress set will bring all the support and comfort you need to get a goodnight sleep.