Packed with technology, the cuffable Ugg Butte boot is cold-weather rated to -32°C (or -25.6°F) 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 full-grain leather and lined with soft sherpa, adding upcycled UGGpure wool for all-day wearability in the mountains or the city.