Kamik Canuck Jr Boot (Toddler/Little Kid/Big Kid) 100% Nylon Rubber sole Shaft measures approximately 5" from arch Heel measures approximately 0.25" Boot opening measures approximately 9.5" around Waterproof 1000 denier nylon upper Sea- sealed construction Removeable 8mm zylex liner Minus 40f temperature rated Adjustable mid-foot laces with bungee lace lock