Premium Orthopedic Seat Cushion: Advanced Gel Memory Foam with BONUS Cover This NEWEST 2016 model, doctor recommended, will ensure that you will receive the best support for your back, rear and tailbone. Stay fresh with lasting coolness when using for longer periods of time, thanks to a recently improved type of gel memory foam. Slip resistant bottom and strong shape retention will make sure the cushion stays where it is and not go flat no matter how much you move around or how long you sit! EXTRA: Enjoy a complimentary cover, easy to remove and made of exceptionally soft velour. Indulge in having two colors to mix and match with.