Muck Boot Chore Classic Tall Steel Toe Men's Rubber Work Boot W/ Metatarsal Guard Rubber Rubber sole 5 mm neoprene provides comfort and flexibility, along with excellent waterproofing, shock absorption and heat retention properties; adjusts to your foot shape to resist blisters and chafing Met Guard is soft and flexible but gets hard when impacted for extreme impact protection to the forefoot; easy-to-clean high-grade rubber overlay with durable, quick-cleaning outsole Breathable Airmesh lining wicks away humidity and perspiration, and allows air to travel throughout the boot; comfort rated from subfreezing to 65 F/18 C Triple toe and quadruple rubber heel reinforcement; Steel shank for support; 16-inch height for added protection; 100% waterproof work boots Steel toe protects against impacts from above; meets ASTM F2413-11 M I /75 C/75 EH Mt/75