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 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 FIT & CONSTRUCTION: Built on a specific women’s foot form that is wider than the industry norm for improved fit & comfort; The sizes listed are women’s and fit true to size; Meets ASTM D471 #903 standards for oil and isooctane chemical resistance SUPPORT: Made with a Nylon Shank, used for midfoot support, and 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, PU midsoles are used for weightless comfort; Moisture-wicking textiles keep feet dry and CLEANSPORT NXT provides natural odor protection using probiotics