Bookishbunny Coccyx Orthopedic Memory Foam Office Chair and Car Seat Pad Comfort Cushion for Back Pain and Sciatica Relief (Purple) Velvet This memory foam seat cushion will add comfort to your chair, bench, car seat, plane seat, floor, or wheelchair. Removable velvet cover is machine washable and allows for easy cleaning Reduces pressure on the coccyx, tailbone and hip bones while sitting Size: 17.72 * 14.17 * 2.76 inch Zippered,machine-washable velvet cover Ergonomic design for promoting healthy posture, proper spine alignment, and superior comfort. Reduces pressure while sitting. Reduces pressure on the coccyx, tailbone and hip bones while sitting. Reacts fast to provide instant relief and comfort. Relieves back aches and pains and even helps with Sciatica. You can use this seat support cushion in the office, at home, or on the go. Use it on office chairs, car seats, wheelchairs, kitchen chairs, lounge chairs, vehicles, and etc. Memory foam filling for retaining shape and promoting healthy spine alignment.Memory foam provides the perfect amount of cushion and support while retaining it&#039;s shape and form. Removable zippered washable velvet cover is machine washable and allows for easy cleaning. Seat Support Pillow measurements: 17.2 x14.2 x2.8 inch (L x W x H)