Packed with chilly-time tech, our cuffable Butte boot is cold-weather rated to -20C (-4˚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, fluffy fabric, adding our UGGpure™ wool for all-day wearability in the mountains or the city. Item No. 5521. Waterproof Waterproof membrane bootie construction Waterproof leather Gusseted tongue with water repellent coating Cuffable shaft 17mm UGGpure™ upcycled wool lining or UGGplush™ 60% upcycled wool, 40% TENCEL™ Lyocell lining, 100% recycled polyester backing, 8mm fluffy poly knit fabric lining made with 80% recycled polyester on quarter and vamp 7mm curly UGGplush™ 60% upcycled wool, 40% TENCEL™ Lyocell EVA footbed or poured PU footbed incorporates at least 25% bio-based content EVA midsole Vibram® outsole 8.5" shaft height Cold-weather rated to -20˚C Heat-embossed UGG® logo, Woven label with UGG® logo Best for: Casual, Light or moderate rain, Light snow, Heavy rain, Heavy snow