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; Designed and built to be 100% waterproof from top to bottom; Nylon shank; 4-way stretch breathable airmesh lining; Comfort range: -50?deg F to 65?deg F; Cut: Mid