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 AirFeel™ Foam, GelTouch® HD Foam and Beautyrest® Charcoal Memory Foam, help you sleep cooler while relieving pressure and adding comfort. The NaturalCool™ Plus cover lets you sleep at a controlled temperature. This Medium pillow top mattress is good for a back or side sleeper.