Ozone-resistant, abrasion-resistant rubber offers 100% waterproof protection. ZXT rubber is a premium compound of rubber that has a high tensile strength, which means greater tear-resistance and greater durability. Trac-Lite slip resistant outsole. Steel safety toe meets or exceeds ASTM standard F2413-11 M I/75 C/75 EH. Electrical hazard (EH) footwear is manufactured with non-conductive electrical shock resistant soles and heels.