Yak fiber

Yak fiber (Bos grunniens) is a rare natural animal-based textile material obtained from the hair of the Himalayan yak, with the highest-quality textile fiber coming from its fine winter undercoat, known as “yak down.” Historically, harvesting this fiber was common in Tibetan, Mongolian, and Himalayan regions as part of nomadic livelihoods, where it was used for weaving carpets, nets, traditional garments, and blankets. Collection takes place during the spring molting season, when the undercoat is manually combed or gathered. It is then washed, dried, further combed, sorted, and spun into fine yarn similar to cashmere and fine wool. Yak down has an average fiber diameter of 16–20 μm and is extremely soft, highly thermally insulating, hypoallergenic, breathable, and has a natural sheen. It is also valued for its high resistance to wear and moisture. In the textile industry, yak fiber is used for luxury knitted and woven garments, scarves, blankets, gloves, hats, underwear, and blended yarns with cashmere, wool, or cotton. The resulting material is lightweight and very warm, often outperforming sheep’s wool and even cashmere in functionality. Its disadvantages include limited availability, higher cost, and more demanding collection processes. However, its ecological production and traditional character make yak fiber a material suited for exclusive and sustainable textile applications.