Our United States Air Force Extreme Cold Mukluk Boots were designed for use in Extreme Cold and Snow. They are water repellent and fire resistant. 20 inch height. Lace up with a YKK Zipper. Comes with felt insoles. DESIGNED TO BE WORN WITH ONE OR TWO PAIR OF THICK WOOL SOCKS. These are Made in the USA and cost the Government $78.24. Wool Liners not included.