Yarn certifications: RWS, RAS, SFA, OEKO-TEX and ETICH-ET explained for fashion brands
The term “certified yarn” does not identify a single guarantee. Some standards address the responsible production of animal fibres and chain of custody; others verify the chemical safety of a textile article or specific organisational scopes. For a fashion brand, reading certifications correctly means understanding which part of the supply chain is covered, which organisation or product falls within the scope and which claims are supported by the documentation. RWS, RAS, SFA, OEKO-TEX and ETICH-ET are not interchangeable labels. They can answer complementary needs, but they must be assessed in relation to the fibre, supplier, certificate validity and individual transaction.
First distinction: raw material, product and organisation
Textile certifications can have different objects and scopes. A scheme may focus on farms and fibre production, animal welfare, land management, social conditions, chain of custody, declared content, harmful substances, processes or company organisation.
These areas are not equivalent. A yarn tested for harmful substances is not automatically covered by a standard on the responsible origin of wool. Likewise, fibre from a certified supply chain does not in itself guarantee that the product has undergone chemical testing.
It is also important to distinguish between certification of the company, site, material or product and documentation linked to a specific transaction. To use a claim correctly, the brand must verify validity, scope and documentary continuity.
RWS: wool, responsible production and chain of custody
RWS, the Responsible Wool Standard, is a voluntary Textile Exchange standard dedicated to sheep wool. Its scope includes requirements applied to primary production and a chain-of-custody system designed to maintain the integrity of claims throughout the supply chain.
For a brand, it is relevant when the objective concerns responsible wool sourcing and the presence of coherent documentation across commercial stages. It does not replace chemical testing, quality assessment or other systems relating to the finished product.
In 2025, Textile Exchange published the Materials Matter Standard, designed to progressively bring several existing standards together. According to the transition announced by the organisation, the new system becomes effective on 31 December 2026 and mandatory on 31 December 2027. In the meantime, RWS remains a reference standard, but buyers and supply chains should monitor updates to scopes and documents throughout the transition.
RAS: the standard dedicated to alpaca fibre
RAS, the Responsible Alpaca Standard, is the Textile Exchange standard dedicated to alpaca fibre. Its framework includes requirements applied to fibre production and a chain of custody intended to support documented claims throughout the supply chain.
For a brand, it is useful when alpaca is a significant component of the collection and it is necessary to verify that the purchased material falls within the certified scope. Scope, validity, composition and transaction-related documents should all be checked.
RAS does not automatically provide an assessment of alpaca fineness, handle or aesthetic quality. These aspects require technical specifications, samples and application tests. RAS is also part of the Textile Exchange transition to the Materials Matter Standard: current certification and the future transition should be read against the latest official documentation.
SFA and the new Animal Fibre Standard
SFA is the Sustainable Fibre Alliance, an organisation active in the development of responsible practices for cashmere. The SFA Animal Fibre Standard v1.0 was published in December 2024 and became effective on 1 April 2025, replacing the previous cashmere-specific standard.
Despite its broader name, version 1.0 continues to cover responsible cashmere production. Its structure was designed to allow possible future extensions to other animal fibres, but it is not correct to describe the standard today as already covering all animal fibres.
For brands, it is important to distinguish between participation in the organisation, certification of primary production and chain-of-custody documentation. The SFA acronym should not be used generically without verifying which material, entity and transaction are covered.
OEKO-TEX STANDARD 100: chemical safety of the product
OEKO-TEX STANDARD 100 covers textile articles tested for harmful substances. It can be applied at different stages, from yarn to finished product, provided that the specific article falls within the certificate.
For a brand, it is useful for documenting the chemical safety of the material within the covered scope. It does not automatically certify responsible fibre origin, animal welfare, technical quality, full traceability or the overall environmental performance of the supply chain.
A yarn can therefore be covered both by a standard on responsible fibre production and by OEKO-TEX STANDARD 100: the two systems answer different questions. It is advisable to verify the certificate number, validity, product class and correspondence between the certificate and the purchased article.
ETICH-ET and verification of the declared scope
The available company documentation lists ETICH-ET among the references associated with the path undertaken by Filatura Pettinata Luisa 1966. The European ETICH-ET mark concerns products and processes in the textile supply chain, with verification focused on chemical safety for the consumer as well as environmental and social aspects. In the case of Filatura Pettinata Luisa 1966, the programme includes supply-chain monitoring through sample analyses of supplies and periodic verification audits.
Conclusion
Yarn certifications and standards should not be read as a single sustainability scale. RWS and RAS concern specific animal fibres and the related chain of custody; SFA Animal Fibre Standard v1.0 is currently focused on responsible cashmere production; OEKO-TEX STANDARD 100 verifies textile articles with regard to harmful substances. ETICH-ET instead concerns products and processes within the supply chain, with a distinct verification scope.
For a brand, the most useful question is not simply “is the yarn certified?”, but “which characteristic is being verified, by whom, with what validity and up to which stage of the supply chain?” Filatura Pettinata Luisa 1966 can provide B2B partners with the documentation relevant to individual projects, to be verified in relation to article, lot and purchasing requirements.
To verify the availability, scope and documentation of certifications applicable to a project, you can request a technical discussion with Filatura Luisa.
Frequently asked questions about yarn certifications
Is an RWS yarn also tested for harmful substances?
Not automatically. RWS concerns responsible wool and chain of custody; testing for harmful substances falls under specific standards such as OEKO-TEX STANDARD 100.
Does the SFA Animal Fibre Standard already cover all animal fibres?
No. Version 1.0 is focused on cashmere, although it is structured to allow possible future extensions.
Is the supplier’s general certificate sufficient?
Not always. Scope, validity, article, composition and documentation linked to the specific transaction should be verified.