Ugg Boots are made of sheepskin, which can be dyed with Rit. Follow the sink or bucket method. However, do not add any extra salt. Be sure to wash the boots first to remove excess dirt and to add them to the dye bath while still wet. This will keep them from floating. Keep them in the dye bath for 30-60 minutes, moving them around to achieve an even color. Rinse thoroughly in cool water and then wash in warm water with a mild detergent. Rinse again. Let dry completely; this may take several days.