"Clean." "Natural." "Non-toxic." "Chemical-free." Not one of those words is regulated. A brand can print any of them on a polyester t-shirt and break no law.
Here's what actually holds up. Five checks, two minutes, works on any brand including ours — and the first three need nothing but the product page and the tag.
Check 1 — Read the fiber content tag, not the product page
The product page sells. The tag discloses.
| What the tag says | What it means |
|---|---|
| 100% cotton / merino / hemp / linen | Natural fiber. No microplastic shedding. |
| 92% cotton, 8% elastane | Synthetic blended through the body fabric — against your skin across the whole garment |
| Bamboo / viscose / modal / lyocell / TENCEL | Semi-synthetic. Plant-derived, chemically regenerated. Better than polyester, not the same as cotton. |
| Recycled polyester | Still plastic. Sheds microplastics identically to virgin polyester. A waste story, not a health one. |
| Nylon, spandex, acrylic, "performance blend" | Synthetic |
The distinction that matters: elastane in a waistband is a few grams at your hip. Elastane blended through the body fabric is in every square inch touching you. Both appear as "elastane" on a tag. Only one is worth caring about, and it's the one in the composition of the main fabric.
Also worth checking: tags, labels and drawstrings. Almost every garment sold — organic ones included — uses a printed polyester care label, because it's cheaper and holds ink better. It's the scratchy tag people cut out. A brand using woven cotton labels and cotton drawcords made a deliberate, more expensive choice, and it tells you how far the material standard actually goes.
Check 2 — Scan the product page for finish words
Chemical finishes are the thing certifications exist to catch. These words mean a finish was applied:
- Water-repellent / DWR / weatherproof — historically the most common route for PFAS into clothing
- Stain-resistant / stain-release
- Wrinkle-free / no-iron / easy-care — often a formaldehyde-based resin
- Antimicrobial / anti-odor / odor-controlling — usually a silver or triclosan-based treatment
- Moisture-wicking finish — note the word finish; a fiber that naturally manages moisture, like merino, is a different claim
None of these are automatically dangerous, and a certified finish has passed a harmful-substance panel. But every one of them is a chemical added to fabric to do a job the fiber couldn't do on its own — and that's a reasonable thing to want to know about.
The alternative is structural. Odor resistance from merino wool, breathability from cotton weight and weave, stretch from a knit construction. Same outcomes, no finish. That's the actual difference between "non-toxic" as a marketing word and as a design decision.
Check 3 — Treat blends, "eco" language and "recycled" as non-answers
Three patterns do most of the work in making synthetic clothing sound clean.
Blends. "Cotton blend," "merino blend," "natural blend" — a blend is a garment that is partly plastic and has been named after the half that sells. If a brand won't put a percentage next to each fiber, assume the natural one is the minority. A real claim reads "100% organic cotton." A soft one reads "made with organic cotton."
"Eco-friendly," "sustainable," "conscious," "responsible," "planet-first." None of these are defined, audited, or enforceable. They describe intent, not composition. A polyester legging can carry every one of them legally.
"Recycled." The most effective one, and the most misread. Recycled polyester is still polyester. It sheds microplastics during wear and washing exactly as virgin polyester does, and it sits against your skin identically. Recycling plastic into clothing is a genuine waste-diversion improvement — it is not a health improvement, and brands routinely let people assume it's both.
The test: can you restate the claim as a number or a material? "100% merino, 165GSM" survives that. "Sustainably made with recycled eco-fibers" doesn't say anything at all.
Check 4 — Look up the certification
If you want to go a level deeper, both major standards run free public lookups.
GOTS — search the public GOTS database by certificate number or company name. The certificate names the holder, the scope, and the expiry.
OEKO-TEX — use Label Check. Enter the certificate number or scan the QR on the label. It resolves to the certified article and the issuing institute.
One thing worth knowing: GOTS has two grades. "Organic" requires at least 95% certified organic fiber. "Made with organic" requires 70%. Both carry the GOTS name and they are not the same claim.
Certificates are normally held by the mill or manufacturer rather than the brand itself — that's standard across the industry and not a red flag. It's why the accurate phrasing is "made with GOTS-certified organic cotton."
Check 5 — Ask for the lab report, not the badge
Certification already covers a lot. Since 1 January 2024, OEKO-TEX Standard 100 has banned PFAS outright, testing total fluorine to a 100 mg/kg limit with individual limits for PFOS, PFHxA, PFHxS and C9–C14 PFCAs. GOTS prohibits PFAS as a chemical input at every processing stage, along with formaldehyde, azo dyes and heavy metals.
So a certified garment has been third-party tested for PFAS already. Brand-commissioned testing on top of that is a bonus, not a baseline.
When a brand does claim its own testing, a real report has four things: the laboratory's name, a date, the substances tested, and a document you can open. If any of those are missing, you have a sentence, not a result.
Red flag: "independently tested" with no lab, no date, and no link.
What a garment looks like when it passes all five
The Wayve Quad Short, $90: a 290GSM brushed terry shell of 100% GOTS-certified organic cotton over a 165GSM jersey liner of 100% merino wool. No blend in either fabric. No DWR, no antimicrobial treatment, no moisture-wicking finish — the merino handles odor and temperature because that's what merino does. Cotton drawstring, cotton brand tag, cotton care and material labels.
Every number in that sentence is something you can check yourself, which is the whole point of the list.
Shop the Quad Short — $90 · See all men's shorts
FAQ
What does "non-toxic clothing" legally mean?
Nothing. There is no legal or regulatory definition of "non-toxic," "clean," "chemical-free" or "natural" in apparel in the US. The enforceable claims are certifications — GOTS, OEKO-TEX Standard 100, RWS — because those have published criteria and an auditing body behind them.
Is all activewear full of PFAS?
No, and it's less common than it was. PFAS entered activewear mainly through durable water repellent finishes and stain treatments. A garment with no water-repellent or stain-resistant finish has no obvious reason to contain them, and any OEKO-TEX Standard 100 certified fabric has been tested against a PFAS ban since January 2024.
Can I test my own clothes?
Consumer PFAS test kits exist but are unreliable for textiles. The practical route is the certificate lookup in check 4 — it's free, it's instant, and it's backed by an accredited institute.
Are certifications held by the brand or the factory?
Almost always the factory. Certification applies to production facilities and supply chains, which is why the accurate phrasing is "made with GOTS-certified organic cotton." A brand claiming to be GOTS certified is usually overstating.
Is organic cotton automatically non-toxic?
No. Organic describes how the fiber was grown — no synthetic pesticides, no GMO seed. It says nothing about the dyes and finishes applied afterward. That's what OEKO-TEX Standard 100 covers, which is why the two certifications are worth having together.