One of the most valuable type of wool is cashmere. It comes from the cashmere goat in Tibet and/or Mongolia. The wool is obtained by combing out the undercoat of the cashmere goat that is finer and of high quality; for this reason, each goat produces only about 500 g wool. This kind of fiber appears radiant, soft and light. It is used for knitwear, capes, and especially for very elegant and high quality apparel.
You can find more information about Cashmere (WS) in Wikipedia.