Specifics: Cushion Material: Super Soft Cover and top grade memory foam that is durable and no matter how many times you sit your pretty butt down it will never go flat! Size: 40cm x 32cm x9cm Special Design 1. Memory foam will change with the temperature changes in hardness, the human body sit on the memory foam cushion, the cushion can sense the human body temperature and change the most suitable hardness to your hip. 2. The unique donut design helps to properly distribute the weight of the sitting body, helping to promote healthy blood circulation and posture as well as spinal alignment. Meet the expert's recommendation. 3. Use this Donut Cushion anywhere!It is particularly suitable as a seat support for wheelchair, office chair or dining chair, as well as for car, truck, bus, plane or train travel. 4. The Orthopedic Ring Cushion has a soft handle,easy to carry and portable.Cover with durable zipper,removable and washable