Ergonomically designed seat cushion provides maximum support and comfort while reducing pressure on the coccyx / tailbone and promotes healthy posture Most Comfortable Memory Foam Donut coccyx cushion for Back pain and sciatica relief, Numbness from prolonged sitting, Seated desk work, cars, flights, Extra padding on hard chairs, Injured tailbone, Improved posture/spine alignment, hemorrhoid, Piles, fistula, Herniated bulging or slipped disc, Pregnancy or childbirth Machine-washable zippered velour cover for easy cleaning and built-in handle for easy transport.