The Ultimate Collection from UGG is just that.....the ultimate in comfort and fit in sheepskin footwear. The Ultimate line features a more form fitting outsole with improved tread for better footing in harsh conditions. The sheepskin is re-enforced in the toe box, heel cup and the back spine for increased durablility and longer wear. The EVA sole has a layer of mylar heat reflective barrier which holds your body heat in while keeping the cold out. The sheepskin inner sole is removable and replaceable. The Ultimate Short is the same height as a Classic Short.....it is the styling and features which are the ultimate. Available for Women in 4 colors, Black, Chestnut, Sand and Chocolate.