He can face inclement weather in confidence with the Youth Rugged II outdoor boots by The Original Muck Boot Company®. Now featuring 5mm of CR Flex-Foam, the newest Rugged boot keeps your little one’s feet warm in extreme cold. An extra layer of fleece adds much needed insulation, while the extended rubber exterior provides impact protection and durability. Ensure your young explorer can tackle the cold with the updated Rugged II sport boot. FEATURES: Stretch-fit topline binding insulates leg to retain warmth Waterproof protection Fleece lining and 5mm CR flex-foam increase warmth Rubber exterior helps to repel water, mud, and snow Extended rubber exterior increases durability EVA midsole adds comfortable cushioning Aggressive rubber outsole delivers durable traction Manufacturer warranty against manufacturer defect 1 year from date of purchase Comfort Range: -40°F to 40°F For additional information relating to the Manufacturer's Warranty, please contact 1-800-333-0895.