Extra layers of rugged protection for active kids! Comfort, warmth and stability for all-day play even on the coldest days. DS1 molded outsole– outer and inner grip 6 layers of protection Extra layers of insulating warmth and protection! 5.5 mm bootie; 2.5 mm DENSOPRENE XD foam (extreme density) for extra protection; 2 mm airmesh; 2 mm warm fleece lining Removable molded EVA sockliner Double achilles heel and instep reinforcement for comfort and protection Nylon shank Dryshod Kids' Arctic Storm Boot - Black/Navy