The Del Ray Pillow Top mattress features Cooltex Adaptive Smart Fabric for a cooler sleeping experience. The Ultra Gel Quilt Foam and Super Soft Convoluted Comfort Foams Cradle & Support your muscles. Quantum Individual Response Coils with Active Edge Support Steel perimeter edge coils offers better support than foam encasement and reduces roll-off at the edge of the bed and firmer seating support.