The Kids’ Rugged II Boot will protect your child’s feet in severe cold with the 5mm neoprene waterproof bootie insulation backed with a fleece lining. This lining adds extra insulation to keep cold out for kids that want to stay outside playing in the snow all day. 100% Waterproof, 100% MUCKPROOF 5mm Neoprene Bootie for Comfort and Performance bioDEWIX™ Anti-Microbial Footbed Insert Topcover with NZYM™ for Odor Control and Moisture Management Extended Rubber Coverage Lightweight EVA Midsole for All Day Comfort and Support Rugged outsole with grip Warm Fleece Lining