Muck Boots Rugged Ll Rubber Kid's Snow BootRubber and Textile Fabric lining Slip On closure 5 mm neoprene provides comfort and flexibility, along with excellent waterproofing, shock absorption and heat retention properties; adjusts to the shape of little feet to resist blisters and chafing High grade rubber exterior provides extra toughness and makes for a 100% waterproof snow boot Soft fleece lining provides superior warmth and comfort in extreme cold conditions; comfort rated to 40 F to 40 F