The memory therapy spring memory excellence 1000 mattress is made from a 25cm layer of memory foam on a traditional coil spring system the memory foam is made from a unique high density visco elastic polymer gel originally designed for nasa missions it is soft and pliable following the outline of your body perfectly the mattress also features a reflex foam boundary around the springs to prevent you from rolling off the mattressfeaturing a zip up fully removable cover which can be dry clea