Tri-BackUp TireBag provides protection from harmful ultra violet rays that can quickly degrade a tubular tire. So the next time you have to replace your tubular tire it’s ready to go. . Provides a compact easy to use solution to carrying extra tubes and keeps them out of the suns harmful rays which can degrade and cause premature failure. Designed to integrate with Tri-BackUp Pro V and Tri-BackUp Pro I for maximum aerodynamic efficiency