Treat yourself to cool, comfortable sleep with the Serta Arctic 13.5-In Medium Hybrid Cooling Mattress. Serta Arctic Hybrid has 15x better cooling powered by exclusive Reactex technology. It’s combined with premium memory foam and an advanced coil system to support your every curve of your body. Serta Arctic 13.5-in Twin Extra Long Hybrid Memory Foam/Coil Blend Mattress in White | 500433368-1020