Wool is a natural animal fiber most notably from sheep, but it can also come from other animals like goats, camels, and rabbits. The ultimate circular fiber, it is 100 percent natural, renewable, and biodegradable, and is the most reused and recyclable of all the major apparel fibers. Wool has long been a staple for traditional coats, warm sweaters, and cozy blankets. Today, however, there’s an increasing demand for high-end merino wool for performance textiles, as consumers continue to choose natural options instead of synthetic.