The Serta Perfect Sleeper Deermore Plush mattress combines some of our latest comfort technologies with a state-of-the-art steel coil innerspring support system. Individually wrapped Premium steel coils balances body-hugging comfort with outstanding support for your body and helps eliminate partner movement. These 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 Twist® Gel Foam to help dissipate heat, you'll be able to get the rest you need. This is a good mattress for a back or side sleeper.