Kamik Icefox2 Boot (Toddler/Little Kid/Big Kid) Nylon Made in US Rubber sole Shaft measures approximately 7" from arch Heel measures approximately 0.5" Boot opening measures approximately 11" around Waterproof 600 denier nylon upper Seam sealed construction Removable 9mm zylextra liner Minus 58f temperature rated Adjustable buckle straps