Houseasy Memory Foam Office Chair & Car Seat Cushion for Back Pain and Sciatica Relief, Gray High-density rebound memory foam: assists in the relief and treatment of lower back pain, numbness, sciatica and pressure sores Non slip bottom: Keeps your cushion in place while you sit so you don't have to constantly reposition, improving posture & providing superior comfort Using range: Superior comfort for office chair, car seat, travel, driving, wheelchair and more Easy cleaning: The cushion comes with a durable, removable, machine washable cover