UGG Butte Chelsea leather fur waterproof black boot. Size: 11。UGG Butte Chelsea boots. size: 11 New in box Waterproof leather uppers and waterproof membrane bootie construction make the UGG® Butte Chelsea a rainy day favorite. Duck boot hybrid features dual gore panels and a pull-tab at heel. 17mm UGGplush™ 80% wool, 20% lyocell lining for warmth. 17mm UGGplush™ 80% wool, 20% lyocell insole with foam for added comfort. EVA footbed and midsole. Vibram® rubber outsole has superb traction with exceptional slip resistance, oil resistance, heat resistance and abrasion resistance.