This mattress is a hybrid, it contains specially made coils and super hybrid memory foam. The phase change Technology incorporates special treatments to these materials that continually adjust to temperature, which create a refreshing surface that feels amazingly cool. There are 2 layers of next generation memory foam with active air technology that increases air flow for a cooler deeper sleep and conforming support for pressure relief. There is a 1000 Coil count that works independently for a maximum amount of partner motion separation transfer to improve the quality of your sleep. The Steel Encasement creates a comfortable edge around the entire mattress. Mattress is 12 inches thick and has a 20 year non-prorated warranty. This mattress also comes with a 180 day comfort guarantee.