The Serta Perfect Sleeper Kleinmon Firm mattress combines some of our latest comfort technologies with a state-of-the-art steel coil innerspring support system. Individually wrapped steel coils supports every body type and help 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 sleeper who prefers a firmer surface.