Columbia Women's Minx Slip II Omni-Heat Snow Boot 100% Textile Imported Rubber sole Shaft measures approximately 8.5" from arch Boot opening measures approximately 13.75" around Omni-Grip non-marking traction rubber. Waterproof woven synthetic textile and medial zipper. Soft faux-fur lining collar. Omni-Tech waterproof breathable seam-sealed membrane bootie construction. 200g insulation. Rated -25F/-32C. Omni-Heat reflective lining., Removable contoured PU footbed.