Discover the luxury of this hybrid king mattress. Temperature-regulating material in the stretch knit cover keeps you at a comfortable temperature all night long. Its high-density gel memory foam and body contouring foam provide firmness and restorative support. The premium pressure-sensitive NanoCoil unit and individually wrapped coils help to provide a great night's sleep. Plus, this mattress arrives in a box for quick and easy setup. Simply bring it to your room, remove the plastic wrap and unroll. Comfort level: ultra plush Dual cooling action with phase changing material (PCM) High-density gel memory foam for lumbar support; high-density body contouring support foam Premium pressure-sensitive NanoCoil unit; individually wrapped coil pack Stability support base Hyper Cool luxury 4-way stretch knit cover for uniform comfort & durability Adjustable base compatible 10-year non-prorated warranty Note: Purchasing mattress and foundation from two different brands may void warranty; see warranty for details Foundation/box spring sold separately Mattress ships in a box; please allow 48 hours for your mattress to fully expand after opening State recycling fee may apply Made in USA model # M50