COLD WEATHER RATED TO -40° F: 8mm removable Thermal liner together with ArcticShield's Patented Retain technology keeps you warm on any frozen tundra down to -40 degree F. Adjustable bungee cord at the opening will keep the snow out.WATERPROOF: These Waterproof boots will keep your feet nice and dry as your out and about in the wet, snowy and muddy outdoors.RUGGED ALL TERRAIN OUTSOLES: Super lite base protects against the cold and wet elements. Durable thick treaded rubber outsole for traction on slippery, icy surfaces.PATENTED RETAIN TECHNOLOGY: Heat-resistant Retain insulation captures and returns up to 90% of your body's warmth, preventing radiated body heat from escaping and cool external conditions from gaining access. Plus, this lightweight, windproof water-resistant insulation keeps you comfortable whether you're trekking in cool weather or outdoors shoveling your way out of the next blizzard.LIGHTWEIGHT AND COMFORTABLE: You will love getting into these boots. You will stay warm and comfortable and light on your feet