Your favorite leggings might be dosing you with toxic “forever chemicals” every time you slip them on.
Mamavation just released updated lab results from an EPA-certified laboratory. They tested 42 popular pairs of workout leggings and yoga pants for organic fluorine — the telltale marker for PFAS. The findings are impossible to ignore.
25% of the leggings tested positive. That means one in four pairs contained detectable levels of toxic PFAS chemicals right against your skin. The highest reading? A staggering 284 ppm in a pair of LulaRoe leggings.
And here’s what should really shake you: the crotch area was the most common location for contamination. Not the seams. Not the tags. The part pressed directly against your most sensitive skin. That pattern strongly suggests intentional fabric treatment — not accidental factory dust.
The good news? 75% of tested brands came back completely clean. Functional, stretchy, sweat-wicking leggings do NOT require PFAS. The safe options are already on the market. You just need to know which ones.
THE WORST OFFENDERS: “NOT OUR FAVORITE”
These brands tested positive for organic fluorine at 10 ppm or higher:
- LulaRoe Leggings — 284 ppm (highest in the entire study)
- Lululemon Align High-Rise Pant — 32 ppm
- Vuori Elevation Performance Leggings — 23 ppm
- Knix Hightouch High Rise Leggings — 19 ppm
- Athleta Girl Chit Chat Shorts — 17 ppm
- Boody Motivate 3/4 High Waist Tights — 17 ppm
- Old Navy Active Go-Dry Leggings — 17 ppm
- Gaiam High Rise Yoga Pants — 15 ppm
- OYA Femtech Apparel Yoga Pants — 10 ppm
- Yogalicious “Lux” High Waist Capri — 10 ppm
Ten parts per million was the detection limit. Any reading above zero means the lab found something. And “something” in this case means PFAS — the same class of chemicals linked to reduced immunity, metabolic disease, fertility problems, lower sperm count, elevated cholesterol, and increased risk of kidney and testicular cancers.
Pete Myers, Chief Scientist at Environmental Health Sciences and Adjunct Professor at Carnegie Mellon, reviewed the data. His verdict? “While we know that PFAS can be absorbed through the skin, we don’t have much information about how much would be transferred from activewear products. It’s unlikely to be 0.”
Translation: Your skin is absorbing it. The only question is how much.
THE MIDDLE GROUND: “BETTER”
These brands tested clean at 10 ppm — no detectable organic fluorine. However, they are made from conventional synthetics like polyester, nylon, or spandex:
Alo, Nike, Under Armour, Fabletics, Girlfriend Collective, Sweaty Betty, prAna, SPANX, L.L.Bean, Reebok, NOBULL, Zella, CALIA by Carrie Underwood, GapFit, Mizuno, Lorna Jane, YPB by Abercrombie, Marika, Revive, 90 Degree by Reflex, All In Motion (Target), BLANQI, LIVI (Lane Bryant), Nike Universa, and Zyia Active.
No PFAS detected. That is a genuine win. If you already own these, you are not being chemically exposed through your leggings.
The trade-off? These are still petroleum-based synthetic fabrics. They will not biodegrade. They may shed microplastics in the wash. For high-intensity workouts where sweat-wicking is non-negotiable, they are a solid, safer compromise.
THE GOLD STANDARD: “BEST”
These brands passed the 10 ppm test AND use sustainable or organic materials such as GOTS-certified organic cotton or low-emission alternative fabrics:
- BRANWYN Essential Compressive Shorts
- Definite Articles Women’s 7/8 Sculpt Legging
- Groceries Apparel Leggings
- Maggie’s Organics Blackout Pocket Leggings
- MATE The Label Organic Stretch Legging
- Pact Organic On The Go-To Pocket Legging
- PuraKai Pocket Leggings
This is the tier for yoga, loungewear, walking, and everyday living. Natural fabrics. Zero detected PFAS. No petroleum-based synthetics pressed against your skin for hours at a time.
HOW DOES PFAS EVEN GET INTO LEGGINGS?
Three pathways, according to manufacturing experts interviewed by Mamavation:
- Intentional treatments — stain-resistant, water-repellent, or “moisture-wicking” chemical coatings applied directly to fabric.
- Manufacturing lubricants — fluorinated sprays used on factory equipment that transfer to cloth.
- Clean-out chemicals — fluorinated solvents used between production runs that are not fully rinsed away.
The crotch-area contamination pattern points heavily to door number one: intentional treatment. Brands are adding these chemicals on purpose, then selling you “performance” fabric that happens to come with a side of forever chemicals.
THE REGULATORY WILDER WEST
Here is the part that should make you furious: almost nobody is stopping this.
Maine passed a law banning all PFAS compounds in consumer products. It does not take effect until 2030. California and New York are “exploring” textile regulation. Nothing has passed. At the federal level, PFAS restrictions target drinking water, food packaging, cookware, and personal care products.
Clothing? Essentially unregulated.
Groups like Toxic-Free Future and the Mind the Store Campaign are pressuring retailers — especially REI — to eliminate PFAS from clothing and outdoor gear. Target has already shown improvement. Several Target-house brands tested clean in this report.
But voluntary improvement is not protection. Your vigilance is the only regulation that matters today.
WHAT TO DO RIGHT NOW
- Check your drawer. If you own any of the “Not Our Favorite” brands listed above, consider replacing them. You wear leggings skin-tight, often for hours, sometimes in heated conditions that open pores. That is the worst possible exposure scenario.
- Shop the “Best” list for low-impact activities. Yoga. Lounging. Walking. Errands. Organic cotton and sustainable fabrics reduce your chemical exposure to effectively zero.
- Use the “Better” list for hard workouts. When you genuinely need compression and sweat-wicking, choose the synthetic brands that tested clean. No PFAS beats no PFAS, regardless of fabric philosophy.
- Spread the word. Most women have never heard of PFAS in clothing. Share this ranking. Tag a friend who lives in leggings. The only reason brands keep using these chemicals is because customers do not know to demand better.
THE BOTTOM LINE
75% of tested leggings were completely clean. That single fact demolishes the excuse that PFAS is somehow “necessary” for stretch, performance, or comfort. It is not. It is a cheap shortcut, and brands that care are already proving you can sell functional activewear without poisoning your customers.
Your skin is your largest organ. It absorbs what you put on it. Choose leggings that respect that fact.
Safe, stylish, non-toxic leggings exist. The list above is your map. Use it.
Source: Mamavation Non-Toxic Activewear Guide — PFAS Lab Test Results, published September 22, 2026. Products tested by an EPA-certified third-party laboratory using ion-selective electrode and oxygen flask combustion methods. Detection limit: 10 ppm organic fluorine. Scientific review by Pete Myers, PhD (Environmental Health Sciences / Carnegie Mellon University) and Scott Belcher, PhD (North Carolina State University). Medical review by Sondra Strand, RN, BSN, PHN. Study funded by Environmental Health News and Mamavation community donations.