Made from premium grade ozone (O3) resistant rubber, these dielectric overshoes are 100% waterproof. Their flexible hand-layered construction included a durable nylon lining for easy donning and doffing. The sole features durable construction and a non-skid bar tread outsole. Attached buckles and hardware are non-metallic. Conforms with ASTM F1117 and is tested to ASTM F1116 at 20kV (20,000 volts). Made in The U.S.A.