Salisbury’s dielectric boots are 100% waterproof and made from premium grade ozone resistant rubber. The flexible hand-layered construction includes a durable nylon lining for easy on/off. Salisbury Dielectric Footwear conforms with ASTM F1117 and is tested to ASTM F1116 at 20kV. The sole has a durable construction with a non-skid bar tread outsole. The attached buckle and hardware is nonmetallic. Manufactured in the U.S.A. NEW improved overshoes Salisbury’s now offers improved 51511 non-buckle overshoe and 51512 2-buckle overshoe. The improved overshoes include a bob sole with aggressive tread for better traction. The deep heel and improved arch are specially designed for climbing ladders comfortably. The wider opening allows for easier on/off.