Give your chilly-weather ensemble a fashionable upgrade with the UGG Mason Wedge Winter Boot. A cushioned foam insole lined with UGGpure wool keeps your foot dry, warm, and cozy, while a waterproof construction ensures that moisture does not seep in. Cushioned foam insole lined with 7mm curly UGGpure wool Seam-sealed waterproof construction 10mm sheepskin lining 100g critical zone insulation Molded rubber outsole.