Kids' Nuuk Shoe from PAX are warm lined winter boots for children. With a warm wool lining in VENTAIR® technology, little feet are kept both warm and dry. VENTAIR® is a membrane that makes the boot both wind and waterproof, while keeping the feet ventilated. All shoes from PAX are free from PVC, Teflon, hexavalent chromium, PTFE and other fluorinated hydrocarbons.