2. Rayon (Viscose)
Rayon is a fiber that is made from cellulose that is chemically converted from wood pulp. Not only is the production of this material dangerous, but wearing it can also be unhealthy. Rayon fabric can emit toxic substances that can cause nausea, headaches, vomiting, chest and muscle pain, and insomnia. In addition to all that, its production is heavily polluting the environment.