What does OEKO-TEX Standard 100 Class I actually certify?
If you shop for baby clothes for more than about ten minutes, you will see the OEKO-TEX label. It appears on sleepwear, bedding, towels and swaddles, usually with no explanation attached. This page explains what the certification actually covers, what it does not, and how to check whether a claim is real.
We reference this standard on several pages of our own site, so it seemed only fair to explain it properly rather than let the logo do the work.
There are four product classes. Class I is the strictest.
OEKO-TEX Standard 100 sorts certified goods into four classes, based on how much contact the textile has with skin:
- Product class I — “Babies and small children up to 3 years”
- Product class II — materials with direct skin contact, such as bed linen
- Product class III — materials without direct skin contact, such as jackets
- Product class IV — home textiles and decoration materials, such as curtains
The logic behind the tiers is stated plainly by OEKO-TEX: “The more intensive the skin contact and the more sensitive the skin is,” the stricter the requirements become. A baby has thinner skin, a higher surface-area-to-body-weight ratio than an adult, and a habit of putting fabric in their mouth. Class I limit values are set accordingly.
This matters when you read a label. A product certified to Standard 100 is not automatically certified to Class I. A jacket certified under class III has met a genuine standard — just not the one written for infants.
What is actually tested
Certification tests a finished article against what OEKO-TEX describes as “a list of over 1,000 harmful substances.” The catalogue includes substances regulated by law and substances that are not yet regulated anywhere but are considered a concern.
Named groups include banned azo colourants, pentachlorophenol, per-fluorinated substances (PFAS, PFCs), cadmium and lead. The catalogue also incorporates:
- REACH Annex XIV and XVII
- The US CPSIA lead requirements
- The EU POPs regulation
- “All textile relevant substances of the ECHA SVHC candidate list”
The point worth holding onto: the test catalogue is broader than any single country's law, and it is updated as new substances are flagged.
It covers the whole garment, not just the fabric
This is the part most people miss. Certification is not a fabric certificate that a brand can wave at a finished product. OEKO-TEX requires that “all components of the article to be certified must comply,” and describes the outcome as every “thread, button and accessory” having been tested.
For a zip-front sleeper that means the shell fabric, the thread, the zipper tape, the zipper pull, the labels and any print or trim all have to pass. A garment cannot be built from a certified fabric and an uncertified zipper and still carry the certificate.
It expires every year
“The STANDARD 100 certificate is valid for 1 year.” Certification is not permanent, and a brand holding a certificate from four years ago does not hold a current one. Renewal means re-testing.
How to check a certificate is real
Every valid certificate carries a certificate number and the name of the issuing test institute. OEKO-TEX runs a public verification tool: you can scan the QR code on the label or enter the certificate number directly on their website to see whether the certificate exists, who holds it, which product class it covers and whether it is still in date.
If a brand mentions OEKO-TEX but will not give you a certificate number, there is nothing to verify. That is worth noticing.
What OEKO-TEX Standard 100 does not tell you
It is a human-health standard for harmful substances in the finished textile. It is not:
- An environmental certification. It says nothing about water use, emissions, or the chemistry of the pulping process. OEKO-TEX runs separate standards for those.
- A labour or ethical standard. Working conditions are covered by different schemes.
- A flammability certification. In Canada, children's sleepwear flammability is governed by its own regulations — we wrote about what those rules actually require.
- A guarantee of fibre content. That is a labelling matter, governed here by the Textile Labelling Act.
A garment can be Class I certified and still be badly made, badly labelled, or wrong for safe sleep. The certificate answers one question well and stays silent on the rest.
Where Wame stands on this, precisely
Our fabric specification requires OEKO-TEX Standard 100 Class I certification. That is a requirement we have written into the spec, not a certificate we are holding up today.
Wame is pre-launch. Independent third-party laboratory testing will be completed before any product is offered for sale, and we will publish the results — including certificate numbers you can verify yourself — once we hold them. Until then we describe this as a requirement, because that is what it is.
We would rather be the brand that explains the difference than the brand that lets a logo imply something it has not earned yet.
Sources
Read next: Viscose from bamboo, bamboo lyocell, bamboo linen: what the names actually mean — and why Canadian law will not let anyone call it “bamboo”.
The Bamboo Zip Sleeper is designed in Alberta, Canada, in 95% viscose from bamboo and 5% spandex at 250 GSM. It is in development — join the waitlist to hear when it launches.
