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; Designed and built to be 100% waterproof from top to bottom