Kamik Women's Shellback Insulated Winter Boot 100% Textile Made in the USA and Imported Synthetic Shearling Snow Collar Synthetic sole Shaft measures approximately 10" from arch Heel measures approximately 1" Boot opening measures approximately 10" around Winter boot featuring D-ring lace-up shaft and soft faux-shearling collar Rated to -40 degrees F Removable 8 mm Zylex felt liner