Designers and creators of Ergo21 Seat Cushions with LiquiCell Technology. An aid for Back Pain, Sciatica, numbness. 4 thin Liquid filled membranes on top of high resilience foam reduce vertical pressure and reduced numbness and fidgeting allows one to sit for long periods of time. Uses: Wheelchair, Planes, Trains, Conferences, Cars, office, home seating. Creator of Ergo21 Bicycle Seat Cushion Cover to prevent Numbness for a smooth ride. Our Ergo21 Wheelchair Cushions helps with pressure sores and comes in 4 sizes. Look under Ergo21 Sports Cushion. Ergo21 XL Sports is for heavy and bariatric. Ergo21 Original Cushion works good on an office chair, car, mobility scooters and with our Ergo21 Lumbar Seat Cushion makes a great combination.