The Backsaver was originally developed for military combat pilots. The Backsaver's fluid yet firm support was found to be the best material to minimize discomfort and greatly reduce fatique under very grueling conditions. Backsaver foam absorbs up to 97% of impact energy with low rebound. Although the cushion is only one inch thick, it will not bottom out because of its high energy absorption. Special materials that are bonded to the Backsaver act like a gasket between driver and seat which insures perfect contact for precise feedback. This cushion measures 16" x 18" x 1" thick. A 18" x 24" Large Backsaver Cushion is also available. Either size can be cut with sharp scissors or a shop knife. Two Backsaver pads are shown in photo.