Features of the Merrell Men's Thermo Freeze 6IN Waterproof Boot Waterproof PU coated leather and mesh Upper Metal hook and lacing eyelet for secure lacing Bellows tongue keeps debris out Protective rubber toe cap 400 grams M Select WARM lightweight, low bulk Insulation keeps you comfortable Kinetic Fit Base removable contoured insole for flexiblesupport Molded nylon arch shank EVA Midsole for stability and comfort Vibram Arctic Grip for grip on wet ice 5mm lug depth Breathable: Releases perspiration External moisture from precipitation Sweat and moisture Breaks down odor causing microbes in shoes Infused into shoe lining and materials