The Muck Boots Unisex Mossy Oak Country Arctic Pro is one of the warmest neoprene boots on the planet. Perfect for the hunter or outdoor worker that gets cold easily or is in far northern climates. A popluar boot worn in Alaska and Antartica, these 8mm, 4-way stretch CR Flex-Foam, fleece lined boots set the standard in warmth and protective support at both ends of the poles. The 2mm foam under the footbed assures warmth in temperatures that can drop beyond minus 50 degress or when standing on ice. Also, the topline binding keeps the snow and cold out and warmth inside. Comfort Range: -60 degrees F to 30 degrees F.