In a nutshell, rayon is a fabric made from purified cellulose fibers, which are typically created from wood pulp. Though rayon is derived from natural materials, it requires certain chemicals, so it’s considered to be a semi-synthetic fabric.
One of the most common types of rayon is viscose rayon, which has a lot in common with cotton. It’s breathable, moisture-absorbent, and a popular choice for casual and athletic wear. It also shows up in dresses, blouses, and outerwear. Secondary types of rayon include modal rayon (typically made from beech trees) and lyocell (seen in everything from denim to dress shirts).