The Arctic Pro Steel Toe Insulated Boot is constructed with an 8mm neoprene bootie and fleece lining to provide all-day comfort and warmth in low temperatures. Available in ASTM certification for protective wear in dangerous conditions. Like most Muck Boots, a topline binding keeps the snow and cold out and the warmth in. With the Arctic Pro, you can stay focused and productive, no matter how relentless Mother Nature becomes. Conquer the cold and stay safe on the job with the Arctic Pro Steel Toe Insulated Work Boot – where rugged durability meets uncompromising comfort.