The Impact Gel milebuster brings our revolutionary gel technology to your motorcycle seat. Our patented formula provides exceptional comfort for long rides by absorbing shock and distributing weight. Small: Length = 10 1/4"; Width = 6" Medium: Length = 14 1/2"; Width at widest = 12"; Width at narrowest = 6 1/2" Large: Length = 13 1/2"; Width = 14 1/2" Extra Large: Length = 20"; Width at widest = 21"; Width at narrowest = 15"