STEEL TOE: left and right asymmetrical steel Toe design provides a roomier toe box for maximum comfort and unobtrusive fit; The Louisville 6” steel toe waterproof met. Work boot meets or exceeds ASTM F2412 and F2413 I/75 and C/75 and Mt/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; The Louisville 6” int. Met. Boot does have a mesh liner that integrates with the waterproof membrane TRACTION: oil- and Slip-Resistant, Non-Marking, rubber outsoles are used for improved traction that meet or exceed ASTM F1677 Mark II and astm F2913 SATRA non-slip testing standards; lug sole patterns provide grip even on slick surfaces ADDITIONAL FEATURES: internal met guard is flexible and lightweight for comfort, but hardens up direct impact; features a 90° 5/8" Heel that provides stability and helps "catch or lock" The foot in place; clean sport NXT provides natural odor protection UNDERFOOT PROTECTION: Electrical Hazard (EH) or Electric Shock Resistant (esr) footwear provides a secondary source of protection incase accidentally coming into contact with live Electrical circuits; heat Resistant rubber outsole up to 572° F/ 300° C