What is OEKO-TEX? What the label tests, what it skips, and how to check one

OEKO-TEX is a family of textile certifications run by an international association of testing institutes, and the label most shoppers meet is Standard 100. It tells you a product was tested for harmful substances. It does not tell you the cotton was grown organically, that the dye house treated its wastewater, or that the factory paid fair wages. Here is what the label covers, what it leaves out, and how to confirm that a tag on your jeans is real.

What OEKO-TEX Standard 100 certifies

According to OEKO-TEX, Standard 100 certifies that textiles are harmless to human health by testing them against more than 1,000 harmful substances. The company says the certification applies to every thread, button and accessory in a product, from yarn to finished item, throughout the supply chain.

That is a product test. A garment, or the components that go into it, is checked against limits for substances such as carcinogenic dyes, heavy metals and pesticides. If the item passes, it can carry the label for the period the certificate is valid.

The word that does the work is "harmless to human health." It is a claim about what is in the finished item, not about how the item was made.

The four product classes

Standard 100 sets different requirements based on how closely a product touches skin, according to OEKO-TEX:

• Class 1: baby and toddler products, with the strictest requirements.
• Class 2: items in direct skin contact, such as bed linens.
• Class 3: items with no direct skin contact, such as jackets.
• Class 4: home textiles and decoration materials.

So a Class 1 label on a baby bodysuit and a Class 3 label on a coat are not the same bar. The class is usually printed on the label or certificate, and it is worth reading.

What the label does not say

The name causes confusion. The first syllable echoes "eco," and some shoppers read the label as proof of sustainability. Independent commentary pushes against that. Kalani Home, a home textiles retailer, wrote in November 2019 that OEKO-TEX is a health certification, not an ecological one, and argued that Standard 100 does not guarantee sustainable farming, responsible dyeing or biodiversity protection, only the absence of harmful residues on the finished product.

The same piece notes that conventional cotton, which it says accounts for nearly 25 percent of pesticide use worldwide, can still carry the label. That pesticide statistic is the retailer's claim and we did not trace it to a primary source, so read it as the critics' framing. The structural point stands on OEKO-TEX's own description: Standard 100 tests substances, and says nothing in the overview we read about how fiber is grown.

Kalani Home is also a seller of organic textiles, which gives it a stake in preferring GOTS. Weigh the argument accordingly. It is nonetheless consistent with what OEKO-TEX itself says the standard covers.

The labels that go further

OEKO-TEX runs other programs. MADE IN GREEN combines three pillars, according to the organization: product safety testing for harmful substances, environmental responsibility covering chemical management, wastewater, resource protection and waste, and social responsibility covering fair wages, safe working conditions and a ban on child and forced labor. It adds traceability through a unique product ID or QR code.

OEKO-TEX says MADE IN GREEN requires Standard 100 as a foundation, and requires STeP, its Sustainable Textile Production certification, for all making-up facilities and key component suppliers that contribute at least 5 percent of product weight from wet or chemical processes. STeP looks at facility-level practices. The vendor describes MADE IN GREEN as the only standard that combines all four elements. That is a self-description, and competitors would dispute the word "only."

For fiber-level claims, such as organic cotton, a separate fiber standard is the relevant check. We did not open a fiber standard for this piece, so we make no claim here about how they compare in rigor.

How to check a label

OEKO-TEX offers a free tool called Label Check. You can scan the QR code on the label, or enter the certificate number online. The page then shows whether the certification is valid. For MADE IN GREEN, the product ID reveals the production facilities and countries involved, according to OEKO-TEX.

If a tag has no certificate number or code, the check cannot be done. That does not prove a fake, but it removes the point of the label. Our guide to a fabric many brands pair with this kind of claim, what Tencel is, shows the same pattern: a material or certification name does a lot of work, so check what it measures.

Reading the label in a store

A tag that says "tested for harmful substances" with a certificate number is the standard version. A tag that only shows a logo is harder to check. Look for the number, the class and the name of the testing institute, then run it through Label Check on your phone. Certificates have a validity period, so a number that once passed can lapse, which is another reason to check the tool and not the printed claim.

Our take

Standard 100 is a reasonable minimum, and a chemical safety test is worth having on baby clothes and bedding. It is a poor reason to pay a premium for sustainability. If you care about farming, water and labor, look for MADE IN GREEN or a fiber standard, and run any label through Label Check before you trust it. If you only want to know whether a towel will irritate your skin, Standard 100 answers a narrower question, and it answers it well.