Sorel - Mounty (Coffee) - Men's: Rugged leather upper. Removable 9mm ThermoPlus felt InnerBoot. 2.5 mm bonded felt frost plug in the shell to provide an extra layer of insulation and warmth. Handcrafted, waterproof vulcanized rubber shell. Aerotrac sole (natural rubber). Shaft height: 7". Sorel Rated:-40F/-40C.