All Gel Orthopedic Seat and Back Cushion Pad | Upper Lower Back Support Pillow for Car, Office, Kitchen Chair | Pressure Sore, Coccyx Pain Relief | Prevents Sweaty Bottom | Foldable. FOMI’s Cushion (15″ x 17″) and Back Support (19″ x 16″) Combo is the ultimate cushion with unparalleled comfort and support of your full back and buttocks.