Stylish and comfortable, the UGG Kalla Sweater Boot pairs well with anything from your casual wardrobe. An UGGpure wool insole ensures moisture-wicking for warmth, while the Treadlite by UGG outsole provides exceptional cushioning, durability, and traction. This lightweight boot also features a sheepskin lining that offers a luxurious feel. 17mm UGGpure wool insole Treadlite by UGG outsole 17mm sheepskin lining Suede heel counter Button knot closure Nylon binding Woven heel label with UGG logo.