Vicuña
Vicuña wool

Its wool is famous for its warmth and is used for apparel, such as socks, sweaters, accessories, shawls, coats, suits, and home furnishings, such as blankets and throws. Its properties come from the tiny scales on the hollow, air-filled fibres, which causes them to interlock and trap insulating air. Vicuñas have some of the finest fibers in the world, at a diameter of 12 μm. The fiber of cashmere goats is 14 to 19 μm, while angora rabbit is 8 to 12 μm, and that of shahtoosh from the Tibetan antelope, or chiru, is from 9 to 12 μm.
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