420D wheel waterproof cover (4) Suitable for 13-20" Diameter Tires: 4-pack car tire covers, perfect for car, trailer, RV, RV and truck tires. Please measure before purchasing. Material: The tire cover is made of high quality material, aluminum coating (reflective material), good for resisting sunlight, and cotton lining for provide you with better weatherproof tire cover. Hook Design: The hook and the elastic rear swing allow you to securely attach the tire cover to the wheel even in windy weather, easy to put on and take off. Adjustable: the size of the wheel cover from relief can be adjusted freely, and there are straps on both sides for reinforcement. Function: Protects tires and wheels from damage caused by sun, dirt, rust, corrosion and various weather conditions when your vehicle is parked. Keep your wheels in good condition and extend their life.