Muck Boot Grit Tall Steel Toe Men's Rubber Work Boot Synthetic 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 Protective high-grade rubber overlay provides puncture resistance while remaining flexible with every step; 15-inch height for added protection; 100% waterproof work boots Lightweight and breathable mesh lining keeps feet well ventilated for long-wearing dryness; comfort rated from subfreezing to 65 F/18 C Stretch-fit Comfort Topline snugs calf to seal in warmth while keeping cold and debris out; rear pull loops for easy on/off; steel shank for support Rubber cup outsole offers superior shock absorption, comfort for long periods of standing, and excellent grip on wet concrete floors or uneven surfaces; steel toe protects against impacts from above; meets ASTM F2413-11 M I/75 C/75 EH