Yak is a natural fiber obtained from the undercoat of the domestic yak, which is a long-haired mammal found in the Himalayan region of Asia. The fiber is soft, warm, and lightweight, making it an ideal material for producing warm clothing, rugs, and blankets. Yak wool is also known for its superior insulation properties, which can help keep the body warm in extreme cold climates. The fibers are coarser than sheep wool but are softer and finer than cashmere fibers. It is also considered to be more eco-friendly than other animal fibers as yaks are pasture-raised and require less land than sheep or goats, making it a sustainable and ethical choice.