Visco-elastic molded gel eliminates pressure points or hot spots that cause discomfort Absorbs vibration and can be preheated or cooled to add comfort No permanent straps-a rubberized surface prevents it from sliding off the seat Cover is made of genuine Australian sheepskin, for increased comfort, allowing air to circulate, and virtually eliminating perspiration 16-1/2" wide at rear 12" front to back 9" wide at front