Waterproof (Waterproof membrane bootie construction, Waterproof leather, Waterproof suede, Gusset) Leather upper with cuffable shaft, Brisa sheepskin cuff 17mm sheepskin shaft lining and UGGplush wool sockliner Vibram outsole with ICETREK rubber compound for traction, Cold-weather rated to -32°C 3M Xerogel Insulation, DryTech Technology