Do Synthetic Fabrics Contain PFAS?

By Lowtoxgear Editorial · Updated

Most people asking "do my clothes contain PFAS" are thinking about their rain jacket, not their cotton t-shirt. That instinct is largely correct. The PFAS concern in clothing is not about the fibre itself — it is about the chemical finishes applied to make fabrics water-repellent, stain-resistant, or oil-resistant.

This is a specific and solvable problem. Understanding which finishes to avoid and which certifications to trust will help you make better decisions when buying outdoor and activewear. It's one part of the broader PFAS exposure picture.

The short answer

Synthetic fabrics (polyester, nylon, acrylic) do not inherently contain PFAS — the fibre itself is not the issue. PFAS appear in the DWR (durable water-repellent) finishes applied to rain jackets, hiking gear, and some activewear. Traditional DWR used long-chain C8 PFAS chemistry; most major brands have now transitioned to shorter-chain C6 chemistry or non-fluorinated alternatives. C6 has a shorter biological half-life than C8 but is still a PFAS. Truly PFAS-free alternatives exist — they use wax, silicone, or polymer-based DWR instead of fluorochemicals. California's AB 1817 (effective January 2025) bans intentionally added PFAS in textiles. Look for bluesign certification or an explicit "PFC-free" or "fluorine-free" label when buying technical outdoor clothing.

Why this happens

DWR coatings work by reducing the surface energy of the fabric, causing water to bead and roll off rather than soak in. Fluorochemicals are particularly effective at this because fluorine has the lowest surface energy of any element — water and oil cannot grip a fluorinated surface. This is also why PFAS are used in cookware, food packaging, and fire-fighting foam.

Long-chain C8 PFAS chemistry (including PFOA and related compounds) was the industry standard for decades. Research at high exposure levels linked these compounds to health effects. Under international pressure, major outdoor brands committed to phasing out C8 by 2023. Most have done so, moving to shorter-chain C6 alternatives.

C6 chemistry still involves PFAS — the fluorine chain is just shorter. The argument for C6 is that shorter chains have lower bioaccumulation potential and shorter biological half-lives. The argument against is that C6 compounds are less studied, still persist in the environment, and still contaminate waterways when garments are washed. Some researchers and regulators argue the whole fluorochemical class should be replaced, not just the longer chains — this is the position reflected in California's AB 1817 and the EU's proposed PFAS restrictions.

Non-fluorinated DWR alternatives are now used by several brands. They include polymer-based finishes (polyurethane, polysiloxane) and wax-based treatments. Performance data from independent testing suggests these can match C8 performance in moderate rain but may not hold up as well under sustained heavy rain. For everyday use, the performance difference is minimal.

What to look for

"PFC-free" or "fluorine-free" DWR: A manufacturer claim. More credible when backed by a third party.
bluesign certified: An independent textile certification that restricts PFAS-based DWR. One of the most meaningful labels for outdoor clothing.
OEKO-TEX Standard 100: Tests finished textiles for a range of harmful substances including some PFAS variants, though its PFAS scope is narrower than bluesign.
GOTS (Global Organic Textile Standard): Primarily for organic natural fibres, but also restricts chemical finishes. Relevant if buying organic cotton or wool with a DWR treatment.
See the certifications guide for a full breakdown of what each label covers.

What to do

For everyday clothing (t-shirts, jeans, underwear) — no action needed. DWR finishes are not typically applied to these items.
When buying a new rain jacket or outdoor gear, look for a brand that explicitly states "PFC-free" or "fluorine-free DWR" and ideally holds bluesign certification. Brands that have transitioned include Patagonia, Picture Organic, and others listed in the PFAS-free clothing collection.
For existing gear you want to maintain: re-treating worn DWR with a non-fluorinated DWR spray is a practical option. These are widely available and restore water-repellency without adding fluorochemicals.
Washing habits matter: PFAS in clothing enter waterways through laundry drainage. A microfibre filter bag (for microplastic capture) will not capture dissolved PFAS, but washing less frequently and at lower temperatures reduces overall chemical release.