merino certifications, in plain english

Covers how the wool is produced, from farm to yarn.

The Responsible Wool Standard, run by Textile Exchange, certifies sheep welfare (including no mulesing), responsible land management, and a chain of custody that tracks certified wool from the grower through to the finished yarn. When wool is sold as RWS-certified, that traceability is independently audited rather than self-declared.

Tests the finished material for harmful substances.

OEKO-TEX Standard 100 is a laboratory certification: the yarn or fabric is tested against a long list of harmful substances — including PFAS, formaldehyde, heavy metals, and banned azo dyes — and must come in under strict limits. It’s the most practical signal a shopper has that a textile is free of the chemistry discussed in our PFAS in activewear guide, because you can verify it rather than take it on trust.

Mulesing is a controversial wool-industry practice; “mulesing-free” is a claim worth checking. RWS certification requires it, which is one reason it’s a stronger signal than a brand simply stating “ethical wool.” Our merino is Australian and RWS-certified.

The two certifications answer different questions. RWS tells you the wool was grown responsibly and is traceable; OEKO-TEX tells you the finished cloth is clean to wear. A garment with both has covered the welfare-and-origin side and the what-touches-your-skin side — which is the standard we hold ourselves to. The science behind the “clean to wear” claims is on our research page.

Words like “eco,” “natural,” “sustainable,” and “non-toxic” aren’t certified by anyone — anyone can print them. A real certification names the standard (RWS, OEKO-TEX Standard 100), and you can usually verify it. If a claim can’t be checked, treat it as marketing, not fact.