Get more comfortable sleep with the Morning extra firm hybrid mattress. The cool-to-the-touch surface is made with HeiQ V-Block technology, which kills harmful microorganisms and prevents them from affecting the appearance and lifespan of mattresses. HexCloud Gel Memory Foam, a Serta exclusive, features unique geometric cut outs to deliver cool, contouring pressure relief for relaxing sleep. The Custom Support Coil System with BestEdge Foam Encasement technology provides contouring support for any sleep position. This mattress also includes a layer of PillowSoft Aire and layers of support foam. This mattress is CertiPUR-US certified, hypoallergenic, and compatible with adjustable bases.