ARS-MH-BK Arctic Storm Arctic StormExtreme-Cold Conditions Winter Boot Extra layers of protection provide unsurpassed warmth on the coldest days! DS1 molded outsole – outer and inner grip 6 layers of protection plus EVA cold-blocking midsole = 7 layers 5.5 mm bootie 2.5 mm DENSOPRENE XD foam (extreme density) for extra protection 2 mm airmesh 2 mm warm fleece lining = 11 mm of insulating warmth and protection! Removable molded EVA sockliner Double achilles heel and instep reinforcement for comfort and protection Nylon shank Comfort Range down to -50 degrees