Defeet Slipstream Shoe Covers are designed to wear over your cycling shoes to protect you against the cold and provide an aerodynamic advantage. Stayfast cuff for a comfortable, durable, no snag fit. En-Duro-Skin construction places Cordura nylon on outside of shoe cover for maximum durability, abrasion resistance, and wind deflection Achill-E-Shield reinforcement extends durability in high-stress area Cut guide for cleat Four-Season usage