ProTaper A50 Aluminum Handlebar Black Variant:31.8mm and Wrinkles from the Calf 056465016940 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) An equally smooth operator on city bike paths and country trailsPowerLink® "no weak link" technology lets you insert tapered down in low stress sections 8mm diameterPolish Black or Polish Silver finishCut marks provide a range of width optionsTextured Grit Grip finish in clamp areas eliminates over tightening of componentsAlignment marks for ease of install and accurate adjustment