This is the backrest with an inflatable air bladder that provides customized support of the lower back. Unlike static backrests that only support one area of the back, this superior model has an interior air bladder that adjusts to any position along a 10" vertical range, placing compression precisely where it’s desired. A tethered pump inflates the air bladder to a preferred level of firmness, helping shift shoulders back to prevent slouching, relieve stress on the discs, and provide optimal spinal curvature to reduce back pain. Ideal for use on recliners, desk chairs, or in a car, an elastic support strap secures it over a seat back. With a carrying handle for easy portability and removable fabric cover. Black. 21" L x 17 1/2" W x 4" D. (4 3/4 lbs.)