This mattress is an all foam mattress with 4 different foam layers. Starting with the bottom layer there is a 4 inch motion reducing foam followed by another 4 inches of premium comfort foam. These are topped off by a 2 inch layer of synthetic latex and then 2 inches of temperature sensitive Gel Infused Memory Foam. Mattress is 12 inches thick and has a 20 year non-prorated warranty. This mattress also comes with a 180 day comfort guarantee.