Yazer Premium Durable New Soft Memory Foam Seat Cushion Great for Car,Travel,Wheelchair,Office for Lower Back Pain (U Shape B, Purple) Unique Design-Highest quality 100% memory foam,slow rebound zero pressure,won't go flat over time like standard foam cushions,The chair pad will stay on most surfaces. The sciatica seat cushion comes with a removable washable cover for easy cleaning Widely Used for many chairs:The coccyx seat cushion is suitable for many different types of chairs such as, office or kitchen chairs, lounge chairs, vehicles (cars, buses, planes, trains, etc), wheelchairs, and more. Suitable for all body size Ergonomically Designed: This seat cushion has a special shape helps distribute weight properly which reduces pressure,help with sitting pain due to sciatica,herniated discs, tailbone injuries, pregnancy back pain, hip pain, hemorrhoids and other spinal issues Easy clean:The zippered velour cover is easily removable, and is machine washable for easy care. Health Benefit:The lumbar cushion can facilitate treatment and recovery from back pain, sciatica, pressure ulcers, and more