This is the lumbar cushion used by truck drivers to relieve point-of-contact pressure and reduce lower back discomfort inherent in long periods of sitting. Only available at Hammacher Schlemmer, and unlike foam or springs that apply counter pressure, the medical-grade elastic gel interior has a patented honeycomb shape that distributes weight evenly to adjacent columns, eliminating pressure points and providing support. The cushion's contoured edges enables it to fit on most office chair and car seat backs; an adjustable strap wraps around the seat and secures in-place with an ABS buckle. Its 2"-thick gel interior creates the sensation of resting on air as it conforms to the unique shape of your body, mitigating impact on joints and muscles no matter how you sit. The durable elastic gel won't develop permanent depressions and it immediately reclaims its original form when you get up. Includes a washable polyester/spandex cover. 15" H x 9" W x 2 3/4" D. (2 lbs.)