Packed with pressure-relieving foam, the Serta iComfort CF4000 Quilted II Medium mattress is ideal for sleepers who desire a medium firm feel. Created with high-performance fibers, the Max Cold cover offers an instant cool-to-the-touch feel. Every iComfort mattress is made with exclusive Carbon Fiber Memory Foam, which channels heat away from your body and provides exceptional strength for back and neck support. Its new UltraCold System delivers cooling technology that absorbs extra heat as you sleep. Enhancing pain relief, Air Support foam harnesses air-cushion technology to cradle your pressure points for soothing support. At the core, an iComfort hybrid support system is designed with individually wrapped coils that move independently with your body. Plus, BestEdge foam encasement features extra firm sides to reduce your chances of rolling off the bed. 10 Year Limited Warranty