Comfortable down to -22°FUPPER: Seam-sealed waterproof genuine buffalo leather upper, Leather is from a tannery rated gold for its water, energy, and waste management practices, Padded collar and tongue, HEAT-MX sustainable thermal insulation, Moisture-wicking boa liningINSOLE: Removable, EVA footbed for cushioning and comfort, Odor-eliminating, natural and non-toxic Cleansport NXT treatment