The waterproof leather and textile keeps the weather out whilst the reflective lining and insulation keep the heat in. The simple bungee closure means your little ones can pull these on at the first sight of snow. One-piece injection molded TPR shell/outsole Waterproof PU coated leather and textile upper. Omni-Heat reflective lining. 400g insulation. Omni-Tech waterproof breathable construction. Bungee closure system Please note: Laces and zippers incorporated in Columbia footwear are not waterproof.