ObboMed SS-2780 360&deg; Rotation Compact Portable Swivel Donut Seat Cushion with Non-Skid ABS Base and Washable Cover, Easy Movement for Back, Hip, Tailbone Pain Suffers, Smaller Size 15&rdquo; x 2&rdquo;, 1 PC Donut design to help reduce pressure on tailbone and spine Ball-bearing roller mechanism allows 360 turning without bending Durable & lightweight ABS base with slip-resistant bottom conforms to seat Puncture-proof molded foam for extra comfort. Removable and washable cover 4 cm/ 1.57 inches thick padded foam holds up to 130 kg/ 300 lbs * NOTE: This product doesnt fit properly for seat shape and seat size of general sports cars or vehicle seat with an uneven surface on both side. For car seat use, please check models: SS-2710 (Special Size For Car) or SS-2720 (Ultra-Thin) Reduce strain and stress on your back and hip while getting in and out of car seat. Donut seat design help relieve pain from hemorrhoids and other perinea issues. Non-skid plastic base is durable after long-term use. Conforms to most chairs and add height for drivers to have a better view. High density molded foam has 1.57 inches / 4 cm thickness and puncture-prof quality for extra seat comfort. Its maximum weight capacity is 300 lbs / 130 kg. Come with a washable cover for personal hygiene maintenance. Time-endurance household / vehicle essentials for those who suffer tailbone, back, and hip injuries 1 x Swivel Donut Padded Seat Cushion 1 x Color Insert Dimensions: Diameter x Height: 15 x 2 inches / 38 x 5 cm ; Donut inner hole: Diameter x Height: 17 x 5 cm Max. Support Weight: 300 lbs / 130 kg Color: Blue Material: Polyester cover, polyurethane foam, and ABS base Latex: No