The Serta Perfect Sleeper Elite Trelleburg Luxury Firm Mattress combines some of Serta's latest comfort technologies with a state-of-the-art steel coil innerspring support system. Individually wrapped steel coils balances body-hugging comfort with outstanding support for your body. The coils are then surrounded by a foam encasement that supports the edge of the mattress giving you full use of the surface. These mattresses are an ideal solution for those who prefer the look and feel of a traditional mattress with the benefits of advanced comfort and support features. With a layer of Cool Action™ Gel Memory Foam to help dissipate heat, you'll be able to get the rest you need. This mattress has a touch of softness at the surface yet a firm support, perfect for a stomach sleeper or if you like a firmer feel to your mattress.