The all new Perfect Sleeper collection boasts 40% better pressure relief than the previous collection. The custom support coll system of individually wrapped coils, provide curve hugging support and reduces the motion of partner movement. Comfort layers include the exclusive HexCloud™ Gel Foam, which provides pressure point relief. A layer of WonderCloud™ Memory Foam, also exclusive to Serta, for cloud like comfort. A cooling cover is breathable and cool to the touch for that perfect feel. This extra firm model is good for a stomach sleeper or a back sleeper who prefers a very firm feel.