The Cloud 9 helps relieve pressure on your lower back when sitting on hard surfaces. It’s the Quick, Easy and Affordable way to transform any chair into a comfortable ergonomic seat. It comes with a Tailbone cutout for Sciatica & Back Pain Relief. The Cloud 9 features Sit-On-Air™ Comfort Gel that adds Bounce, Lift and Coolness for all-day comfort. The special ergonomic design promotes good posture while maintaining the natural curve of your spine. Its contoured shape instantly molds, comforts and cradles you for fantastic pressure-relieving support and comfort. Lightweight and portable, it works great on office chairs, home chairs, car seats, airplane seats and wheelchairs. Machine-washable soft velour cover for easy cleaning and it has a non-slip bottom that provides optimal support on all surfaces.