Packed with technology, our cuffable 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 leather and suede lined with soft sherpa, adding our innovative UGGpure™ wool for all-day wearability in the mountains or the city.