The Upeasy Seat Assist has a fire retardant, waterproof coating to protect the surface of the foam cushion. The Upeasy has a removable, machine washable cover. The piston on the Upeasy slowly and automatically lifts up to 80% of your weight and has six weight settings. No wires, motors or batteries required. The Upeasy can be purchased with standard or V-Foam, a viscose elastic memory foam which has good pressure relieving qualities as well as adding extra comfort. Available in Navy only. (6-16.5 stone)(14-25 stone)