Versatile 2in1 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. The chair pad's ergonomic shape naturally conforms to your body with a durable memory foam core that keeps its shape. With a staycool breathable mesh cover and elastic strap that easily slips over a seat back, it's perfect for adding comfort to a car seat, desk chair, wheelchair and more. 15 1/2" sq. seat cushion is 3 1/2" thick.