Left and right asymmetrical aluminum toes weigh 35% less than steel and offer a sleeker appearance. KEEN.DRY waterproof, breathable membrane. Waterproof leather upper. TPU shank for midfoot support. KEEN Luftcell PU midsole, infused with air for weightless comfort. Electrical hazard (EH) or Electric Shock Resistant (ESR) footwear provides a secondary source of protection in case of accidental contact with live electrical circuits. Siped outsole disperses liquids quickly for increased traction. Removable metatomical PU footbed. Oil- and slip-resistant non-marking rubber outsole. Cleansport NXT(TM) Technology for natural odor protection.