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.