Northside Icicle Snow Boot 100% Manmade Imported Synthetic sole Shaft measures approximately 8.25" from arch Heel measures approximately 1" Platform measures approximately 0.5" Boot opening measures approximately 11.5" around Zip-front boot featuring 420D nylon upper with 200g Thermolite insulation that provides -25 F rating Lined for warmth and comfort Removable EVA insole with sherpa lining