WATERPROOF: KEEN.DRY waterproof breathable membrane keeps your feet dry and comfortable all day long by allowing vapor out without letting water in 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 CONSTRUCTION: Direct-attach construction provides long-lasting cushioning and reduces the chance of footwear separating over time, because the best boot is the one you keep wearing ICE GRIP & WARMTH: KEEN.RUGGED abrasion-resistant outsole for durable rugged traction which improves flexibility and grip while walking on snow or ice; Heat reflecting board provides a thermal barrier MATERIALS: Waterproof oiled full grain leather for improved durability and that classic look; Environmentally preferred premium leather supplied from certified tanneries