The Kids&'; Rugged II 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. Extended Rubber Coverage Rugged Outsole for Traction and Durability Warm Lining: Soft, Insulation, Light-weight, Performance Materials for Warmth and Comfort bioDEWIX(TM) Dry Footbed Insert Topcover with NZYM(TM) for Odor Control and Moisture Management 5mm Neoprene Bootie for Comfort and Performance Lightweight EVA Midsole for All Day Comfort and Support