The BBB Rainflex Shoe Covers are lightweight are made with extremely flexible lycra, which protects against wind and rain thanks to the PolyUrethane coating on the outside. All seams are covered with waterproof tape on the outside, preventing any water to leak through. Are you looking for ultimate rain protection for your feet? Features Lightweight and aerodynamic shoecover that protects against wind and rain. Lycra covered with polyurethane (PU) rubber gives the highest level of water-resistance and flexibility. 40 mm wide elastic band prevents water to come in from the top opening.Industrial-strength YKK-zipper. Flap behind the zipper. All seams are covered with waterproof tape, preventing any water to leak through. Reinforced parts on the sole as well as on the nose. Best suited for road shoes due to aerodynamic fit.