Sleepfresh Coppercool 12" Medium Hybrid King Mattress balances cooling technology with supportive hybrid construction to keep nights restorative and comfortable. A Coppercool cooling cover and memory foam comfort layer create a breathable sleep surface while a responsive coil core and polyurethane foam base deliver pressure relief and lasting support. With a medium feel, this Eastern King mattress offers a blend of contouring and lift that suits couples and a variety of sleep positions.