You would not willingly swallow a chemical linked to cancer, thyroid disease, and immune suppression. But if you are wearing a waterproof jacket or stain-resistant trousers right now, that chemical is sitting against your skin — and it has been since the day you bought it.
PFAS — per- and polyfluoroalkyl substances — are a family of over 14,000 synthetic chemicals used across industries, from non-stick cookware to food packaging. The textile industry is one of the largest users. And unlike most chemicals, PFAS never break down. Ever.
What Are PFAS?
PFAS are fluorinated compounds built around one of the strongest chemical bonds in nature: the carbon-fluorine bond. This makes them extraordinarily resistant to heat, water, oil, and biological degradation. It also makes them nearly impossible for your body — or the environment — to eliminate.
Key facts about PFAS:
- The family includes over 14,000 distinct compounds — only a fraction have been studied for health effects
- They are called "forever chemicals" because they do not break down in the environment, water, or human tissue
- The half-life of PFOS (one common PFAS) in the human body is 3.4 to 7.4 years
- PFAS have been detected in the blood of 98% of Americans tested by the CDC
- They accumulate over time — every exposure adds to your total body burden
Where PFAS Hide in Your Wardrobe
The textile industry uses PFAS to create water-repellent and stain-resistant finishes. A 2022 study published in Environmental Science & Technology systematically tested clothing from major retailers and found alarming results:
That last statistic is the most unsettling. Nearly one in three garments with no stain or water resistance claims still contained detectable PFAS. The highest-risk categories include:
| Garment Type | PFAS Prevalence | Typical PFAS Use |
|---|---|---|
| Waterproof jackets | ~88% | Durable water repellent (DWR) coating |
| Stain-resistant trousers | ~72% | Fluorochemical finish |
| Outdoor/hiking gear | ~60-80% | DWR, membrane treatments |
| School uniforms | ~50-65% | Stain-resistance treatment |
| Some activewear | ~30-40% | Moisture management, odour resistance |
| Work uniforms | ~40-60% | Stain and soil resistance |
School Uniforms: A Special Concern
Multiple investigations have found PFAS in children's school uniforms. A 2023 Canadian study detected PFAS in over half of the school uniform samples tested. Children are more vulnerable to chemical exposures than adults — their bodies are still developing, they have higher skin-surface-area-to-body-weight ratios, and they wear these garments for 6-8 hours daily, five days a week.
What PFAS Do to Your Body
The health effects of PFAS exposure are well documented and growing more alarming as research continues. The US National Academies of Sciences issued a landmark report in 2022 confirming associations between PFAS and multiple health outcomes:
- Cancer: PFAS exposure is linked to kidney cancer, testicular cancer, and elevated risk of several other cancers. The International Agency for Research on Cancer classified PFOA (a common PFAS) as a Group 1 carcinogen in 2023
- Thyroid disease: PFAS interfere with thyroid hormone production and regulation. Studies show a dose-response relationship between blood PFAS levels and thyroid dysfunction
- Immune suppression: PFAS reduce vaccine effectiveness — children with higher PFAS exposure show lower antibody responses to routine vaccinations
- Reproductive harm: Associated with reduced fertility, pregnancy-induced hypertension, and preeclampsia
- Liver damage: PFAS exposure is associated with elevated liver enzymes and non-alcoholic fatty liver disease
- Cholesterol: Even low-level PFAS exposure is linked to elevated LDL cholesterol
How PFAS Transfer from Clothing to Your Body
For years, the textile industry argued that PFAS in clothing posed minimal risk because skin absorption was supposedly negligible. That argument collapsed in 2024.
Research from the University of Birmingham demonstrated that PFAS migrate through skin, with absorption rates increasing significantly under conditions that mimic real-world wearing: sweating, body heat, and friction. The study found that shorter-chain PFAS — the very compounds the industry switched to as "safer" replacements — were actually absorbed more readily than the older long-chain versions.
This means:
- Sweat accelerates PFAS transfer from fabric to skin
- Activewear treated with PFAS poses a higher absorption risk because you are sweating while wearing it
- The "newer, safer" short-chain PFAS replacements may penetrate skin more easily
- Absorption continues for as long as you wear the garment — it does not diminish over time
How to Avoid PFAS in Clothing
1. Read Beyond the Marketing
Any of these terms likely indicate PFAS treatment:
- "Stain-resistant" or "stain-proof"
- "Water-repellent" or "waterproof" (unless PFC-free is specified)
- "Scotchgard" or "Teflon" treated
- "Durable water repellent" or "DWR"
- "Soil release" finish
2. Choose PFAS-Free Alternatives
For waterproofing, proven alternatives exist:
- Wax coatings — traditional, effective, and completely PFAS-free (Barbour, Fjallraven G-1000)
- PFC-free DWR — silicone-based water repellents used by Patagonia, Gore-Tex (newer lines), and Nikwax
- Ventile cotton — tightly woven long-staple cotton that is naturally water-resistant
- Natural rubber — for rain gear, a completely non-toxic barrier
3. Look for Certifications
- OEKO-TEX Standard 100 — tests for some PFAS compounds (though limits vary by class)
- GOTS (Global Organic Textile Standard) — prohibits PFAS in certified products
- bluesign — restricts the use of long-chain PFAS in manufacturing
4. Prioritize What Touches Your Skin
If you cannot avoid all PFAS-treated garments, focus on the pieces closest to your body. Base layers, underwear, pyjamas, and activewear matter more than an outer jacket you wear over other layers.
5. Skip Stain Resistance for Children
Children are more vulnerable to PFAS than adults. Opt for untreated school uniforms even if they stain more easily. A stained shirt is better than a chemically treated one against developing skin.
The Regulatory Landscape
Regulation is catching up — slowly:
- EU: Proposed a near-total ban on PFAS in textiles, expected to take effect by 2027
- California: AB 1817 banned PFAS in textiles effective January 2025 — the first US state to do so
- Maine and Minnesota: Have passed PFAS restrictions that include textiles
- EPA: Set enforceable drinking water limits for PFAS in 2024, but has no textile-specific regulation
Until regulation is universal, the responsibility falls on consumers to check what they are buying. That starts with knowing what your clothes are made of — and what has been applied to them.