West Biking Bicycle Cycling Lock Shoes Covers Light Weight Easy Dry Dust-Proof Overshoes polyester 1. Premium stretch fibers and fabrics, easy off and on; 2. Reduce resistance and good windproof, better for your nice cycling. 3. Protect your cycling shoe from the rain, sand and salt on the roads. 4. High quality for long time and repeated use 5. Size : M (US 7-7.5), L (US 8-9), XL (10-11)