The Beautyrest® Harmony™ collection, the Cayman Series, provides exemplary support along with multiple cooling technologies. The targeted support system focuses additional support in the center third of the mattress. Multiple premium comfort layers including AirCool® Foam, AirFeel™ Foam and Beautyrest® Charcoal Memory Foam, help you sleep cooler while relieving pressure. The NaturalCool™ cover lets you sleep at a controlled temperature. This Medium mattress is good for a back, stomach or side sleeper.