Relax on firm support without pressure. Durable orthopedic seat cushion evenly distributes weight and encourages good posture, for maximum comfort and spine support even when sitting for long periods. Center cutout reduces pressure on the coccyx, perfect for anyone prone to lower back pain, numbness or pressure sores. Zip polyester mesh cover with non-slip bottom allows for cooling air flow. Polyurethane foam coccyx pillow keeps it shape and is ideal for home, travel and wheelchair use. Chair pad measures 16 1/2" W x 14 1/2" D x 3" H. Machine wash cover in cold water, gentle cycle; tumble dry low. Do not bleach or dry clean. Spot clean pillow.