Composite Toe: left and right asymmetrical, non-metallic composite toes are 10% lighter than steel, offer an unobtrusive fit and meet or exceed ASTM F2412 and F2413 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; this boot does have a liner that integrates with the waterproof membrane Traction: oil- and Slip-Resistant, Non-Marking, rubber outsoles combined with keen.Polar traction micro-glass fibers technology create a "micro cleat" Effect for increased ice traction Insulated & non-metallic: 400G keen.Warm insulation for extra warmth in colder environments; 100% non-metallic construction allows for easily passing through metal detectors in highly-secured areas Underfoot protection: Electrical Hazard (eh)-rated footwear provides a secondary source of protection incase accidentally coming into contact with live Electrical circuits; 90 degree heel provides stability and helps "catch or lock" The foot in place