OEKO-TEX and GOTS Explained: What Each Certificate Actually Proves

Certificates are the currency of trust in textile sourcing, and like any currency they attract counterfeits, misquotes and wishful spending. The two names that dominate every supplier conversation — OEKO-TEX and GOTS — certify entirely different things, and buyers who conflate them either over-pay for assurance they did not need or under-protect claims they legally must back.

This guide closes the certification chapter of our Turkish textile industry hub with the working knowledge: what each standard covers, how verification actually works, and what to require per product.

What OEKO-TEX Standard 100 covers

Standard 100 is a product-safety test, full stop. Laboratories check the finished article — fabric, thread, buttons, prints, zips — against limit values for hundreds of harmful substances, from formaldehyde and heavy metals to restricted dyes. Certification comes in four product classes, and the class is the detail that matters: Class I is the strict babywear tier, Class II covers anything worn next to skin such as underwear and shirts, Class III covers outer layers, Class IV covers furnishing textiles.

What it does not say is just as important. Standard 100 makes no claim about organic content, environmental practice, water treatment or working conditions. A conventionally grown, conventionally dyed polyester tee can hold Standard 100 honestly — it simply contains nothing harmful at the tested thresholds. Related marks from the same issuer extend the family: STeP certifies production facilities, and Made in Green combines both with supply-chain traceability.

What GOTS covers

The Global Organic Textile Standard answers a different question: is this product genuinely organic, all the way down? GOTS requires certified organic fibre — labelled "organic" at 95%+ content, "made with organic" at 70%+ — and then audits every processing stage: ginning, spinning, knitting, dyeing with restricted chemistry, sewing, even wet-processing wastewater and a floor of social criteria. The output is a chain of custody, not a lab result.

Two documents make the chain real. The scope certificate shows a company is certified to process organic goods, listing exactly which operations and product categories. The transaction certificate covers a specific shipment, proving those particular bales, rolls or cartons flowed through certified hands. Bulk organic claims without transaction certificates are stories, however sincere.

The supporting cast, briefly

Four more names complete a buyer's working vocabulary. OCS tracks organic content like GOTS but without the environmental and social layers — lighter and cheaper, common on basics. GRS does chain-of-custody for recycled fibre, increasingly demanded in EU-bound polyester. BSCI and Sedex/SMETA are social-compliance audit systems, not product certificates; they describe the factory's labour practices and appear alongside, never instead of, the product marks above.

How to verify a certificate number

The step that separates professional buyers from hopeful ones takes two minutes. Every genuine certificate carries a number, and every serious issuer runs a public register. For Standard 100, use the label check tool at oeko-tex.com — it returns the holder, scope and validity for any number. For GOTS, the standard's public database lists every certified operation and its scope. Check four fields against the PDF the supplier sent: the holder name (is it this company, or their fabric supplier?), the scope (does it cover this product category and this processing stage?), the class or label grade (babywear claims need Class I, organic claims need the right content tier), and the expiry date.

The holder-name check catches the most common misuse in the market: a garment factory presenting its mill's certificate as its own. For substance testing that can be legitimate — if the certified fabric arrives finished and the factory adds only certified components — but for GOTS it never is, because the chain breaks at the first uncertified operation. When in doubt, ask the factory to state in writing which certificate covers which stage; honest suppliers answer in one email, as the questioning patterns in our manufacturer vetting checklist predict.

What to actually require, per product

• Baby and children's wear — Standard 100 Class I on the complete garment including trims; add GOTS if you market organic. Non-negotiable for kidswear programs, where retailers and parents both check.
• Underwear, tees, bedding — Class II coverage; organic marketing claims need GOTS or OCS with transaction certificates per shipment.
• Outerwear and denim — Class III is sufficient for substance safety; buyers pushing sustainability stories should ask about GRS for recycled content and the laundry's water treatment.
• Every product — a current social audit (BSCI or SMETA) for the sewing site, because product certificates say nothing about the people.

Certification in Türkiye is abundant enough that requiring the right paper costs you almost no supplier options — mills and factories acquired these scopes years ago to serve European retail. Filter for certificates directly in the supplier directory, then spend your two minutes on the register lookup anyway. Trust the paper only after the database agrees with it.