The OTSO spike soled winter boot is designed and engineered for total confidence in icy conditions. Made with a Pomar spike sole consisting of rubber and steel studs which bite into sheet-ice, it offers maximum slip resistance and traction. OTSO is wrapped in supple black nappa and insulated with synthetic fur for extra warmth when the temperature drops. LAST WIDTH: H UPPER MATERIAL: Black nappa WARM LINING: Insulated with a warm synthetic fur lining designed for cold winter conditions REMOVABLE COMFORT INSOLE: Comfort for your feet! SPIKE SOLE: Combination of rubber and steel studs bite into sheet-ice providing maximum slip resistance and traction in icy conditions. (Not recommended for indoor use) ZIPPER: Quick and easy to put on and take off