Board lasting Protective rubber border Inner shaft with aluminum insulation Completely waterproof thanks to PU membrane with bonded seams Vibram Outsole Absolute Aluminia Thermal Insulation Blackfin III WP High Men - for technical winter terrain. With a winter-specific rubber mix, the Vibram sole ensures improved support and increased grip, even on icy surfaces. Membrane prevents the penetration of water. The warm lining provides the shoe with optimum insulation and heat performance in winter, and is guaranteed to counteract cold feet.