When I decided to build NZ Charly around locally made, certified natural fibres, dye safety was not something I spoke about publicly very often. It felt technical. Harder to explain than the possum conservation story or the WholeGarment zero-waste process. But it is one of the reasons I chose to work with Woolyarns in Wellington, and it matters in a way I think is worth explaining properly.
The short version is this. The yarn in every NZ Charly garment is dyed and processed at Woolyarns' Wellington facility to EU REACH standards, under a Toitu Envirocare Gold certified environmental management system, using water drawn from the Hutt Aquifer and treated to comply with New Zealand's Resource Management Act. That is not a marketing statement. Each part of it is independently audited and verifiable. Here is what it actually means in practice.
Who Woolyarns Are and Why It Matters
Woolyarns is a Wellington-based yarn manufacturing company with decades of experience producing custom luxury yarns for the New Zealand and international textile market. They are the source of the Perino yarn range used in NZ Charly's merino, possum, and silk blends, and they supply ZQ-certified merino fibre from New Zealand Merino Company growers.
The reason the source of a yarn matters for dye safety is that most of the chemical processing in a finished garment happens at the yarn stage, not the garment stage. The fibre is scoured, treated, dyed, and finished before it ever reaches a knitting machine. If you want to understand what chemicals are present in a finished garment, you need to understand how the yarn was made.
Most garment brands do not have direct visibility into the yarn manufacturing process. They purchase finished yarn or finished fabric, often from offshore suppliers, with limited insight into the chemical processes used to produce it. NZ Charly works directly with a single New Zealand yarn manufacturer whose processes are independently certified and audited. That is an unusual degree of supply chain transparency for a small brand.
EU REACH: What the Standard Actually Requires
The European Union's REACH regulation, which stands for Registration, Evaluation, Authorisation and Restriction of Chemicals, is widely regarded as the most comprehensive chemical safety framework for consumer goods in the world. It restricts or bans hundreds of substances of very high concern from use in products that come into contact with human skin.
For textiles specifically, REACH covers restricted azo dyes that can release carcinogenic aromatic amines, heavy metals used in certain dye fixatives, formaldehyde in finishing treatments, certain flame retardants, and a range of other compounds associated with skin sensitisation, endocrine disruption, or carcinogenicity.
Woolyarns produces all yarns to EU REACH standards. This means the dyes, chemicals, and processing agents used in producing the yarn that goes into every NZ Charly garment have been selected to meet the most stringent consumer chemical safety framework currently in operation anywhere in the world.
EU REACH compliance is not a marketing badge. It is a specific technical commitment to avoiding hundreds of substances that other manufacturers are still permitted to use in markets with less rigorous regulation.
Toitu Envirocare Gold Certification
Toitu Envirocare is a New Zealand-based certification body with international recognition that independently audits and certifies environmental management systems across a range of industries. Woolyarns holds a Gold certification for their Environmental Management System through Toitu, which is the highest tier available under the programme.
This certification is not self-assessed. It involves a thorough independent audit of Woolyarns' environmental management practices across their entire manufacturing operation, with regular ongoing audits to maintain certification. The Gold tier reflects a demonstrated commitment that goes beyond baseline compliance.
The Hutt Aquifer and On-Site Dyeing
Woolyarns operates an on-site dyeing facility at their Wellington premises, which is supplied with water drawn from the Hutt Aquifer. The Hutt Aquifer is a natural underground freshwater reservoir beneath the Hutt Valley that supplies water to the wider Wellington region and is subject to strict environmental management under the Greater Wellington Regional Council.
On-site dyeing gives Woolyarns direct control over the entire dyeing process, including the chemicals used, the water temperatures applied, and the treatment of wastewater before discharge. This is meaningful because it means there is no outsourcing of the dyeing stage to a third party whose practices are unknown or unaudited. Every dye bath that touches the yarn that goes into an NZ Charly garment is managed within the same certified environmental system.
Woolyarns consistently achieves a low-risk category for trade waste consent under local council evaluation. This means the wastewater leaving their facility after the dyeing process meets the chemical pollution standards required by the Greater Wellington Regional Council under the Resource Management Act. Independent, not self-reported.
What This Means for the Person Wearing the Garment
Bringing this back to the question raised in part one of this series: what does your clothing do to your skin over time? In the case of an NZ Charly garment, the answer is shaped by the following chain of decisions.
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Natural fibre, not synthetic
All NZ Charly blends are built around natural protein or cellulose fibres. There are no polyester, acrylic, or microplastic-shedding fibres in the range, with the exception of the small nylon component in the performance blend, which is used structurally and sits at 10 percent of that specific blend only.
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ZQ certified merino from verified New Zealand farms
The merino fibre arrives at Woolyarns with ZQ certification, meaning its provenance from named farms with audited animal welfare and land management practices is already established before processing begins.
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Dyed and processed at a Toitu Gold certified facility
The yarn is dyed at Woolyarns' Wellington facility under an independently audited environmental management system. The dye chemistry meets EU REACH standards, which restricts the specific compounds most associated with skin sensitisation and longer-term health concerns.
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Knitted in Auckland with no further chemical treatment
WholeGarment knitting on Shima Seiki machines produces a finished garment with no cutting, no sewing, and no additional chemical finishing treatments applied post-knit. What you receive is the yarn, shaped into the garment, without additional processing layers.
No restricted dye compounds
EU REACH compliance means the specific azo dye derivatives, heavy metal fixatives, and finishing compounds most associated with skin sensitisation and transdermal absorption concerns are not present in the yarn.
Audited wastewater discharge
The dye process wastewater is treated and independently evaluated before discharge. Chemical pollution from the dyeing of NZ Charly yarn is managed under a certified system rather than left to discretion.
No microplastic shedding
Natural fibres shed biodegradable particles, not persistent plastic polymers. Every time you wash an NZ Charly garment, the fibres that release into the water are ones the environment can process.
Verifiable, not claimed
Toitu certification, ZQ certification, and EU REACH compliance are independently audited standards. They are not brand-authored sustainability claims. You can verify each of them through the relevant certification bodies.
What We Do Not Claim
Transparency means being honest about limits as well as strengths. NZ Charly garments are not certified organic. Organic certification for wool and natural fibre knitwear involves a separate and significantly more complex supply chain standard that we do not currently hold. The fibres we use are natural, certified to high standards, and processed responsibly, but organic certification is a specific claim we are not making.
We also use a small amount of nylon in one blend, the performance merino, for structural reasons that are explained in detail on our fibres page. We do not hide this. It is the only synthetic component in the range and it is present for a specific functional reason, not as a cost measure.
We would rather tell you what we actually do than what sounds best.
The textile industry is full of sustainability language that does not hold up to scrutiny. Our position is that ZQ certified merino, Toitu Gold certified processing, EU REACH compliant dye chemistry, and natural fibre construction is a genuinely defensible standard. Not perfect. But honest, improving, and independently verified at every stage we can control.
If you have questions about specific certifications, dye processes, or fibre sourcing that are not answered here or on the fibres page, please reach out directly at charly@nzcharly.com. I would rather answer a hard question than leave it unanswered.