Unisex, Size 11 Men/12 Women, Black, Arctic Sport Hi Muck Boots, Comfort Range: -40 Degrees Fahrenheit, -40 Degrees Celsius To 40 Degrees Fahrenheit, 4 Degrees Celsius, 5 mm CR Flex-Foam, Breathable Air Mesh Lining, 2 mm Thermal Foam Under The Footbed, Warm Fleece Lining, Eva Contoured Molded Midsole, Ms-1 Molded Outsole, Comfort Topline.