UGG Men's ButtePerfectly paired with snow gear, the Butte is cold weather rated to withstand temperatures as low as 20C (or 4F). Packed with cold weather technology that can handle any condition, it features waterproof leather and wool lining keep feet warm and dry, while an exclusive Vibram outsole provides superior traction on icy terrain. Waterproof style Waterproof full grain leather upper Cuffable waterproof suede shaft 8mm sherpa lining on vamp and quarter