Columbia Women's Minx Slip-On Omni-Heat Winter Boot 100% Nylon Imported Faux Fur Rubber sole Shaft measures approximately 9" from arch Heel measures approximately 0.5" Boot opening measures approximately 13.25" around Waterproof membrane construction Nylon upper Omni-heat reflective lining 200 grams omni-heat insulation temp rated to -25 degrees fahrenheit