Thermarest Back Rest^® is the original, portable, self-inflating lumbar cushion. One simple adjustment of the valve lets you choose from infinite comfort selections. Deflate slightly for, self-contouring and support customized to your needs. By occasionally changing the amount of inflation, you can alter position and help reduce fatigue; especially when driving long distances. BackRest is constructed of air-tight waterproof nylon bonded to an open cell foam and weighs less than 1/2 lb.

The Thermarest BackRest is amazingly adaptable not only the contour of your low back but additionally the contour of the seat back of virtually any chair you use it with. Simply start with the valve open to reach full inflation. Then close the valve.With the 'Back Rest' in the small of your back, assume your desired position in your chair of choice and slightly open the valve for a second to allow automatic contouring customization to occur...Quickly close the valve and feel the super comfort of unequalled support.