Topfit  Wedge Cushion Coccyx Memory Foam for Cars and Trucks Seat Cushion Black Helps to reduce pressure on the coccyx, tailbone and hip bones while sitting Ergonomic design promotes healthy weight distribution and posture Designed to fit snugly in a car seat or office chair for maximum comfort Zippered, velvet cover is removable and washable which allows for easy cleaning Aids in the relief and treatment of lower back pain, pressure sores and numbness