Sealy's Sleep Essentials Crestview Luxury Firm Mattress features trusted Sealy quality with a fully foam encased high coil density Pocketed Spring Support System. It's heavy duty pocketed springs reduce movement, allow for an undisturbed sleep while layers of Isotonic Memory Foam and Gel Foams offer pressure relief and comfort, and a stretch knit cover with Feran Ice Cooling to help you sleep better.