Packed with technology, our affable Butte boot is cold-weather rated to -32C (or -25.6F) and features waterproof bootie construction, warming insulation, and innovative Vibram® outsoles designed to stay flexible in freezing temps. Rugged on the outside and cozy on the inside, it's made from waterproof leather and suede lined with soft sherpa, adding our innovative UGGpure wool for all-day wearability in the mountains or the city.