Full Grain Leather Waterproof ReVive tech engineered comfort footbed 100% post industrial recycled lining w/ NXT footbed cover Resilient foam cushioning midsole Nylon shank Cement construction Non-metallic exceed ASTM standards for safety and are entirely free of metal Slip-resistant sole reduces the risk of slips and falls Electrical hazard is rated ASTM F2413-11 1/75.