Sleigh all day in style with the UGG Butte Mono. Engineered with cold-weather technology, this silhouette can withstand temperatures as low as -20°C (or -4°F). It is loaded with features like waterproof leather and wool lining to keep your feet warm and dry in freezing weather. Keep your feet cozy and secure with the UGG Butte Mono. UGG Butte Mono features: Waterproof leather upper keeps the moisture out and offers a sleek look. EVA midsole allows excellent cushioning and shock absorption. Vibram outsole delivers superior traction on icy terrain. Weight: 19.22 OZ.