All ugg boots are made of sheepskin, and they come with a sheepskin sock liner which helps to wick away moisture and keep your feet warm and dry during the cold winter months. Besides,all pairs of boots in this range come with a very light and flexible outsole that includes a suede heel guard, which not only protects but also makes the far stronger and therefore more durable. The exterior of UGG Classic Cardy is also peculiar. It comes with three large wooden buttons down the side. This not only helps to improve what is already a great looking boot but also helps you to be a little more creative in the way that they are worn.