Only used it a month till I decided I needed a firmer mattress. Specs: 850 Density Pocketed Coil® technology. Cooling technology is built in with the SurfaceCool™ fiber cover and 2” AirCool® foam top comfort layer which are designed to help wick away heat and maintain breathability. 2" AirCool® Foam, .5" GelTouch® Foam, 1" Energy Foam. Support System: 850 Density Pocketed Coil® Technology, Total Surround BeautyEdge with Quantum Lock, Ventilated AirCool® BeautyEdge® Foam Encasement.