ALLOY TOE: Left and right asymmetrical aluminum alloy safety toes weigh 35% less than steel toes; This work boot meets or exceeds ASTM F2412 and F2413, M I/75, and C/75 EH Standards WATERPROOF: KEEN.DRY is a waterproof, breathable membrane liner that lets vapor out without letting water in for keeping your feet dry and comfortable; These San Jose 6" work boots have a mesh liner that integrates with the waterproof membrane TRADESWOMEN TESTED: Built around women's specific biomechanics and foot structure for improved fit & comfort; Meets ASTM D471 #903 standards for oil and isooctane chemical resistance TRACTION: Oil- and slip-resistant, non-marking, rubber outsoles; Made with wedge tread, and siped outsole that helps provide traction on slick, flat terrain with limited debris buildup; Meets ASTM F1677 Mark II and ASTM F2913 SATRA non-slip standards SUPPORT & COMFORT: These boots come with KEEN Luftcell air-infused, PU midsoles for weightless comfort; Made with a nylon shank, used for midfoot support and superior torsion stability, and moisture-wicking textiles to help keep feet dry