WATERPROOF: KEEN.DRY waterproof, breathable membrane keeps your feet dry in wet terrains; The Greta boot has a mesh liner that integrates with the waterproof membrane INSULATED: KEEN.WARM made from recycled PET plastic with 200G insulation helps keep feet warm in temperatures down to -25° F / -32° C, but still allows feet to breathe ICE GRIP & WARMTH: KEEN.FREEZE outsole for cold weather reduces rubber hardness and improves flexibility while walking on snow or ice; Heat-reflecting board provides a thermal barrier MATERIALS: Waterproof, oiled full-grain leather upper for improved durability and that classic look; Environmentally preferred premium leather supplied from certified tanneries CARE TIPS: To treat day to day wear and tear, especially on lighter color leathers, KEEN recommends using a leather cleaner and conditioner, found at most footwear dealers and/or shoe repair shops