Columbia Childrens Powderbug Forty Winter Boot (Toddler/Little Kid) 100% Textile and Synthetic Importado Rubber sole Shaft measures approximately 8" from arch Heel measures approximately 1" Boot opening measures approximately 11" around Adjustable hook and loop closure strap Recycled 6 millimeter washable recycled felt liner Waterproof synthetic leather and nylon textile 400 grams insulation Rated -40 and -40C