Forever the choice of professional riders. Numerous victories and podiums have proven Criterium the top Pro racing tubular. Tubular tire includes seamless latex tube with removable valve core. Silk casing provides the highest ride quality, thanks to an unmeasurably high thread count of tightly woven, fine silk filaments that produce a thin, pliable and extremely strong fabric. Corespun cotton casing, a favorite of world-class athletes due to the light and supple material that maximizes comfort, control and performance.