The waterproof leather and textile upper keeps the elements out, while the reflective lining and insulation ensure warmth. These boots feature a simple bungee closure, allowing children to easily put them on at the first sign of snow. They are constructed with a one-piece injection molded TPR shell/outsole, waterproof PU coated leather and textile upper, Omni-Heat reflective lining, 400g insulation, and Omni-Tech waterproof breathable construction. The bungee closure system is a key feature. Please note that laces and zippers incorporated in Columbia footwear are not waterproof.