The Muck Boots Arctic Sport Adult Unisex Boots are the king of Muck Boots, these boots are the warmest of the warm good down to -40°F and are amazing for any outdoor activities like snowmobiling, snowblowing, sled riding with the kids and working outside in the cold. These are a one of a kind mega boot. Snow, slush, freezing rain, and all their gloomy allies and do not stand a chance against this boot. Waterproof and insulated, you stay warm and dry with this tall boot shaft that offers extra protection in the drifts. A grippy outsole keeps you firmly planted with every step you take.