Shimano S PHYRE Flash Shoe Cover Black Size:L approximate weight 330g 9080002105 approximate weight 330g and barrel nut combination that has proven strong over the years Shimano utilized extensive wind tunnel testing when developing the S PHYRE Flash Shoe Covers in the quest to conserve as much energy for the rider as possible and to make every second count and Wrinkles from the Calf to the InstepSilicon Grip Fabric at the Calf Opening Prevents Slipping of the Shoe Cover While PedalingHook and Loop Fastener Located on the Bottom of the Foot Provides a Secure Fit and Makes It Easier to Put On and Take Off CoversLarge Cleat Opening Will Clear Any Style of Clipless Pedal CleatCuff Height Is UCI Compliant (Actual Cuff Height May Vary Based on Rider’s Foot and Leg Measurements)