GOTS vs OEKO-TEX vs RWS: What Activewear Certifications Actually Mean

Three certifications cover almost everything worth checking on a piece of activewear, and each proves something different. GOTS verifies that the fiber is genuinely organic and that the people and rivers along the supply chain were protected. OEKO-TEX STANDARD 100 tests the finished garment for harmful chemicals and bans the intentional use of PFAS — but it does NOT mean a product is organic or "PFAS-free." RWS covers animal welfare and land management for wool. If a brand throws around vague words like "eco-friendly" or "non-toxic" with no certification and no license number behind them, treat it as marketing, not proof.

Activewear is the most greenwashed corner of clothing right now. Everything is "clean," "conscious," or "performance with a purpose." Most of it means nothing. The fastest way to cut through it is to know which third-party certifications exist, what each one actually checks, and how to confirm a brand isn't just printing a logo. Here's the plain-English version, with the men's Quad Short as a worked example throughout.

What certifications should gym clothes have?

For natural-fiber activewear, the three that carry real weight are GOTS (organic content + supply-chain ethics), OEKO-TEX STANDARD 100 (chemical safety of the finished product), and RWS (animal welfare for wool). No single certification covers all of it, which is why serious brands stack two or three.

Here's the short version of who checks what:

• GOTS — Is the cotton (or other natural fiber) actually organic, and was it processed without banned chemicals and with basic labor protections? Covers the fiber and the whole chain from farm to finished product.
• OEKO-TEX STANDARD 100 — Does the finished garment — fabric, thread, zippers, buttons, prints — stay under strict limits for harmful substances you'd be wearing against your skin?
• RWS (Responsible Wool Standard) — For wool products: were the sheep treated humanely and was the land managed responsibly?

Everything else on a hangtag ("breathable," "premium," "sweat-wicking") is a feature claim, not a verified standard. Useful, maybe. Proof of nothing.

What is GOTS and what does it actually guarantee?

GOTS — the Global Organic Textile Standard — is the leading certification for organic fibers, and it verifies two things at once: that the fiber is genuinely organic, and that the entire supply chain met defined environmental and social criteria. It's the closest thing the textile world has to a real organic seal.

To carry the GOTS label, a product has to clear several bars:

• Organic fiber content. "Organic" requires at least 95% certified organic fibers. "Made with organic" requires a minimum of 70%. The fibers must come from certified organic farming — no synthetic pesticides and no GMOs.
• Chemical restrictions. GOTS bans toxic inputs like heavy metals and substances known to harm human health or the environment. Only GOTS-approved colorants and process chemicals are allowed — a "no hazard in, no hazard out" approach.
• Wastewater treatment. Facilities have to treat the water discharged from processing, so the dyeing and finishing steps don't dump untreated effluent into local rivers.
• Social criteria. Certified facilities must meet labor standards based on International Labour Organization conventions — no forced or child labor, safe working conditions, freedom of association, and no discrimination.

What GOTS does NOT tell you: that the garment is free of every conceivable chemical residue in the final product (that's OEKO-TEX's job), or anything about animal welfare. It's a fiber-and-supply-chain standard, not a finished-product chemical test.

Worked example: The Quad Short shell is 100% organic cotton — 290GSM brushed terry, made with GOTS-certified organic cotton. If you want the deeper dive on what that label covers, we wrote a full breakdown in our GOTS-certified activewear guide.

What does OEKO-TEX STANDARD 100 mean — and does it mean "organic" or "PFAS-free"?

OEKO-TEX STANDARD 100 means an independent lab tested the finished textile — every component — for a long list of harmful substances and confirmed it stays under strict limits for human contact. It does NOT mean the product is organic, and it does NOT mean it's "PFAS-free." This is the single most misread certification in activewear, so it's worth being precise.

What STANDARD 100 actually does:

• Tests for over 100 harmful substances, including formaldehyde, heavy metals, pesticides, and flame retardants.
• Tests every component of the garment — the fabric, thread, buttons, zippers, prints — not just the main material.
• Applies stricter limits the closer the product is to skin (baby products face the tightest thresholds).

On PFAS specifically — the "forever chemicals" used in water-repellent and stain-resistant finishes — here's the exact scope, because this is where brands overclaim:

• As of January 1, 2024, OEKO-TEX bans the intentional use of PFAS across all its certifications.
• Labs test for specific restricted PFAS (like PFOA and PFOS) and for total fluorine, with a limit of 100 mg/kg.
• But certifying to STANDARD 100 means the product was tested and stayed under limits — OEKO-TEX explicitly does not certify a product as "PFAS-free." No one should say it does. (We won't either.)

So when you see OEKO-TEX STANDARD 100, read it as: "this finished garment was lab-tested for harmful chemicals and passed." Read it as nothing more. Organic? Not implied. Guaranteed zero PFAS? Not what the standard says.

Worked example: The Quad Short carries OEKO-TEX STANDARD 100 (with low-impact dyes). It's also a natural-fiber garment — 100% organic cotton shell, 100% merino wool liner — with no synthetic fabric and no DWR or water-repellent finish applied. That last part matters more than any label: PFAS in clothing typically shows up in water-repellent and stain-resistant treatments, so the most reliable way to avoid them is to skip garments that are treated to repel water in the first place. The certification is the test; the no-DWR construction is the design choice. For the full explainer, see our piece on what OEKO-TEX STANDARD 100 actually covers.

What does RWS mean?

RWS stands for the Responsible Wool Standard, and it certifies that wool came from farms meeting defined animal-welfare and land-management requirements — all the way through to the final business-to-business sale. If you buy merino activewear and care how the sheep were treated, this is the label to look for.

RWS evaluates farms against three buckets:

• Animal welfare. Covers nutrition, living environment, animal handling, transport, and management practices. Notably, mulesing is banned under RWS — that's the practice of cutting skin from a sheep's hindquarters, and its prohibition is one of the standard's headline protections.
• Land management. Farms are checked for soil health, biodiversity, water protection, and responsible fertilizer and pesticide use.
• Social welfare. Working conditions and the health and safety of farm workers.

What RWS does NOT cover: chemical safety of the finished garment (again, OEKO-TEX) or anything to do with organic fiber, since it's a wool-specific standard. And it only applies to wool — you'll never see a legitimate RWS claim on a 100% cotton product.

Which certification proves what? (Comparison table)

	GOTS	OEKO-TEX STANDARD 100	RWS
What it covers	Organic fiber + full supply chain	Chemical safety of finished garment	Animal welfare + land management
Applies to	Organic natural fibers (e.g. cotton)	Any textile, any fiber	Wool only
Proves it's organic?	Yes (95% / 70% thresholds)	No	No
Tests finished product for harmful chemicals?	Restricts inputs; not a finished-product test	Yes — every component	No
Bans intentional PFAS?	Restricts hazardous chemicals broadly	Yes (since Jan 2024) — but ≠ "PFAS-free"	No
Covers labor/social conditions?	Yes	No	Yes (farm-level)
Covers animal welfare?	No	No	Yes
Held by	The manufacturer / supply chain	The manufacturer of the textile	The wool supply chain

The takeaway: these three don't compete — they cover different gaps. A natural-fiber cotton garment that's serious about its claims will typically carry GOTS + OEKO-TEX. A wool garment will carry RWS + OEKO-TEX. Neither pairing makes the other one redundant.

How do I verify an organic cotton claim instead of trusting the hangtag?

Don't trust the logo — verify the license. A real GOTS claim is tied to a license number you can check yourself in GOTS's public Certified Suppliers database. If a brand can't point to a certified entity and a valid scope certificate, the "organic" claim is unbacked.

Here's the buyer checklist we'd actually use:

• Look for the certification name AND a license number. A GOTS logo alone is meaningless; it should be accompanied by a license number you can verify in the GOTS public database (search by company name or the number).
• Ask for the Scope Certificate if it's not linked. A legitimate scope certificate is issued by a GOTS-approved certifier and shows the supplier, the certified scope, and a validity period. "We're working on certification" is not certification.
• Match the certification to the fiber. GOTS on cotton: plausible. RWS on cotton: a red flag — RWS is wool-only. OEKO-TEX on anything: fine, but remember it's a chemical-safety test, not proof of organic.
• Treat "PFAS-free" claims with suspicion. No mainstream textile certification certifies "PFAS-free." OEKO-TEX bans intentional PFAS and tests to limits — that's the strongest standard widely available, and it still stops short of "free." A brand promising "PFAS-free" is either overstating a real test or saying something it can't back.
• Avoid the chemistry by avoiding the treatment. The simplest way to dodge PFAS isn't a label at all — it's choosing garments with no water-repellent or stain-resistant finish. Natural-fiber pieces with no DWR sidestep the most common source entirely.
• Be skeptical of unbacked buzzwords. "Eco-friendly," "clean," "non-toxic," "conscious" — none of these are certifications. If they're not paired with a named, verifiable standard, they're copy.

Run a brand's claims through that list and the greenwashing falls away fast. As an example of how the pieces fit: the Quad Short is built from a 290GSM organic cotton shell (made with GOTS-certified organic cotton) and a 165GSM merino liner, carries OEKO-TEX STANDARD 100, and uses no synthetic fabric and no water-repellent finish — so the certifications, the fiber, and the construction all tell the same story. That's what you're checking for: do the claims line up, and can you verify them?

FAQ

Is OEKO-TEX the same as organic? No. OEKO-TEX STANDARD 100 is a chemical-safety test of the finished product — it confirms the garment was tested for harmful substances and stayed under strict limits. It says nothing about whether the fiber was grown organically. For organic, you want GOTS.

Does OEKO-TEX certified mean PFAS-free? No. OEKO-TEX bans the intentional use of PFAS (since January 1, 2024) and tests for restricted PFAS and total fluorine to a 100 mg/kg limit. But OEKO-TEX explicitly does not certify any product as "PFAS-free" — that's a stronger claim than the standard makes, and no brand should use it.

Can a cotton garment be RWS certified? No. RWS — the Responsible Wool Standard — applies to wool only. If you see an RWS claim on a 100% cotton product, that's a sign someone doesn't understand (or is misusing) the certifications.

How do I check if a brand's GOTS claim is real? Look for a license number alongside the GOTS logo and search it in GOTS's public Certified Suppliers database, or ask the brand for its Scope Certificate. A valid certificate names the certified supplier, the scope, and a validity period, and is issued by a GOTS-approved certifier.

Which certifications should I look for on natural-fiber activewear? For organic cotton pieces, GOTS plus OEKO-TEX STANDARD 100 is the strong combination. For wool pieces, RWS plus OEKO-TEX. The cotton-and-wool Quad Short, for instance, is made with GOTS-certified organic cotton and carries OEKO-TEX STANDARD 100.

Sources: GOTS — The Standard & Ecological/Social Criteria; GOTS — Identify GOTS Goods & Certified Suppliers Database; OEKO-TEX — General Ban on PFAS (Hohenstein); OEKO-TEX STANDARD 100 FAQ (Hohenstein); Responsible Wool Standard — Textile Exchange.