If your looking for a lightweight and warm Pac boot, this is it. Features a 1000 Denier nylon upper, removable 8mm Zylex® liner (a unique liner that consist of three parts 1-Polypropylene to wick perspiration away from the skin, 2-Wool Blend Felt that traps body heat within the felt fibers and 3-Thermal Foil which reflects warmth inside and deflects the outside cold), mid foot adjustable laces, Bungee lock snow collar, and rubber bottom. Height: Men’s 13.5” / Women’s 12” Rated down to -40°F / -40°C (depending on activity level) Imported.