Versatile 2-in-1 chair cushion can be used 2 ways for custom support. Position it upright to support your lower back and help correct poor posture, or use it with the tapered end down to help ease muscle soreness caused by sitting for long periods. This seat cushion is perfect for adding comfort to a car seat, desk chair, wheelchair and more. Seat pad's ergonomic shape naturally conforms to your body. Durable memory foam core keeps its shape. Stay-cool breathable mesh cover. Elastic strap easily slips over a seat back. 15 1/2" sq. cushion is 3 1/2" thick.