The Endura MT500 Mountain Cycling Booty Overshoe II is designed to keep out the elements while standing up to off-road abuse. Made with a nylon-faced neoprene outer for extra warmth and insulation. Full-length zipper down the back provides easy entry for all sizes. Velcro tab across the top of the zipper provides a secure fit. Reflective taping adds visibility when you are training in low light conditions. Molded rubber toe cap with ridged/grooved underside to help when climbing steep and/or muddy slopes. Welded center seam for smooth finish and improved water protection. Endura MT500 Mountain Cycling Overshoe sizing is unique and are expected to run a full-size small. Overshoe fits snugly and should be rolled on over shoes to ensure proper fit and protection. Sizing (Shoe size): S: 5.5-7, M: 7.5-9, L: 9.5-11, XL: 11.5-13, XXL: 13.5-15.