A just-right combo of seam-sealed, weatherproof leather, insulation, and a textile upper brings a cozy factor to everything you do in the city. But, it's the sleek, sneaker-like fit and easy-on design that really make it winter's street-style standout. Seam-sealed, weatherproof protection. KEEN.WARM insulation rated to -4degF-20degC: Who knew charcoal bamboo could create something that keeps your feet warm? But it makes KEEN.Warma "a lightweight insulation that provides warmth where you need it most. Vulcanized construction for a sneaker-like fit. Heat-reflective strobel for extra warmth. Cleansport NXT for natural odor control. Environmentally-preferred premium leather from LGW-certified tanneries. Nylon and leather upper. Removable, fleece-wrapped PU footbed. Imported.