What are PFAS in clothing and why should you care?

PFAS (per- and polyfluoroalkyl substances) are a class of thousands of synthetic chemicals often called "forever chemicals" because they do not break down in the environment or in your body. In clothing, PFAS are commonly applied as water-repellent, stain-resistant, and wrinkle-free finishes. They are especially prevalent in outdoor gear, activewear, and school uniforms marketed as stain-proof or water-resistant.

Research has linked PFAS exposure to a range of health concerns including thyroid disruption, immune system suppression, increased cholesterol, reproductive harm, and certain cancers. When PFAS-treated clothing is worn against the skin, these chemicals can transfer through sweat and direct contact. A 2022 study found measurable levels of PFAS on the skin surface of people who wore treated garments, and the transfer increased significantly during physical activity.

Choosing clothing made from untreated natural fibers is one of the simplest ways to reduce your daily PFAS exposure. Brands carried on ONDU, such as Mate the Label and Organic Basics, avoid PFAS entirely and rely on the inherent properties of fibers like organic cotton and Tencel for performance. Look for OEKO-TEX or GOTS certifications as an additional layer of assurance that fabrics have been tested for harmful substances.