ALLOY TOE: Left and right asymmetrical aluminum alloy safety toes weigh 35% less than steel toes and offer a sleeker appearance; These work boots meet or exceed ASTM F2412 and F2413, M I/75, and C/75 EH Standards WATERPROOF: KEEN.DRY is a waterproof, breathable membrane that lets vapor out without letting water in for keeping your feet dry and comfortable; The San Jose 6” Alloy Toe work boots have a mesh liner that integrates with the waterproof membrane TRACTION: Oil- and slip-resistant, non-marking, rubber outsoles; ; Featuring a 90° heel (5/8") which helps "catch or lock" the foot in place; Meets ASTM F1677 Mark II and ASTM F2913 SATRA non-slip standards SUPPORT: Made with a nylon shank for midfoot support, superior torsion stability and a shellback heel support for locking your foot in place; Electrical Hazard (EH) rated to provide a secondary source of protection from live electrical circuits COMFORT: These boots come with KEEN Luftcell air-infused, midsoles for weightless comfort; Moisture-wicking textiles keep feet dry