Recycled yarn is one of the most asked-about and most misunderstood inputs in custom knitwear. A DTC brand building a sustainability story will say to us, "We want a recycled wool sweater" — and assume the result is a single, verifiable category of yarn with a clean document trail. The reality at the mill level is messier. Most yarns marketed as recycled are blends. Many "100% recycled" claims on a marketing deck do not survive a careful read of the transaction certificate. And whether you end up with a defensible claim or a marketing problem depends almost entirely on how the PO is structured before the yarn is bought.
Licheng is a Dongguan-based custom knitwear manufacturer. We do not hold scope certificates ourselves — we source yarns from mills, and when buyers ask for recycled-content yarns we work with mills that hold their own GRS or RCS scope certificates and forward the supplier documents for buyer review. This guide is written from that perspective: what we can verify, what only the mill can verify, and what a brand needs to put in writing on the PO if the documentation is going to land where it needs to land.
When a buyer says "recycled yarn" they usually mean one of three things, and the three are not interchangeable.
The first is recycled wool. Most recycled wool today is mechanically recycled — pre-consumer cutting waste and post-consumer garments are sorted by color, shredded back to fiber, and re-spun. Fiber length drops every time wool is mechanically recycled, so 100% recycled wool yarn is rare and tends to be coarse, short-staple and limited in color. The vast majority of "recycled wool" yarn is a blend, typically 40-70% recycled wool with the remainder being virgin wool, polyamide or polyester for tensile strength.
The second is recycled polyester (rPET). This is the most mature recycled-fiber supply chain. rPET is usually mechanically recycled from post-consumer PET bottles, and the yarn quality is good — fine deniers, broad color range, reliable strength. For knitwear it shows up most often as a support fiber inside a wool/cotton/nylon blend rather than as the headline material.
The third is recycled cotton. This is the hardest of the three. Cotton fiber length is already short; mechanical recycling shortens it further. As a result, recycled cotton yarn is almost always a blend (commonly 20-30% recycled cotton with 70-80% virgin cotton or polyester), and "100% recycled cotton" yarn at fine knitwear gauges (12GG and up) is rare. Chemical recycling routes exist but are still limited in commercial volume.
If your brand has told consumers their sweater is "made from recycled wool" without specifying a percentage, you have a marketing risk: the actual yarn is probably a blend, and a regulator or competitor can ask you to back the claim up.
Post-Consumer vs Pre-Consumer Feedstock — And Why Buyers Should Ask
Within the recycled category there is a further split that matters: where the recycled fiber came from.
Pre-consumer (also called pre-industrial) feedstock is waste from inside the textile system itself — cutting room scraps, yarn dye lot rejects, knit panel offcuts. It never reached a consumer. It is plentiful, color-sorted, and easy to recycle, but some sustainability frameworks treat it as lower-credit because the waste was generated by industry in the first place.
Post-consumer feedstock is the harder, more credible story: actual used garments collected, sorted, shredded and re-spun. It is what most DTC consumers picture when they read "recycled." It is also more expensive, lower in volume, and color-limited because the input garments are not color-controlled.
GRS (Global Recycled Standard) tracks both but treats post-consumer content as a distinct line item on the transaction certificate. RCS (Recycled Claim Standard) is content-focused and allows either. If your sustainability narrative leans on "saving garments from landfill," you need post-consumer feedstock specifically — and the GRS or RCS scope certificate alone does not tell you which one is in your yarn. Only the transaction certificate against your specific shipment does.
GRS and RCS are both run by Textile Exchange and use the same chain-of-custody framework, but they cover different ground.
RCS is narrow and useful as a content claim. It verifies the percentage of recycled material in a product (down to 5% minimum for the RCS Blended logo, 95%+ for the RCS 100 logo). It does not require environmental processing criteria or social criteria at the recycler/mill.
GRS is broader. It requires the same recycled-content verification (20% minimum) plus environmental processing requirements, chemical restrictions, and social criteria at every certified site in the chain. A GRS certificate carries more weight with European retailers and is the more common ask from EU DTC brands.
Both standards work the same way structurally:
|
| Scope Certificate | A specific facility (e.g. a spinning mill) is certified to process recycled material under GRS or RCS for stated fiber types | Approved certification body (Control Union, ICEA, etc.) | That any specific shipment of yarn contains recycled content |
| Transaction Certificate (TC) | A specific shipment of certified material moved from one certified site to the next, with stated recycled percentage and weight | Approved certification body, issued per shipment | Anything beyond the specific transaction listed |
| Mill Test Report / Composition Report | Fiber composition of a specific yarn lot, lab-tested | Mill internal lab or third-party lab | Origin of the recycled content — it sees composition, not history |
| Recycler Declaration | The recycler's statement of feedstock origin (post- vs pre-consumer) | The recycler |
The critical asymmetry buyers miss: a scope certificate proves capability. A transaction certificate proves a specific shipment. If a mill shows you a beautiful GRS scope certificate but cannot produce a transaction certificate for the yarn lot that went into your knitwear, the chain is broken and the recycled claim on your hangtag is unsupported.
For a recycled wool sweater destined for a DTC site that says "made from recycled wool fiber," the document chain should look like this:
1. Recycler holds GRS or RCS scope certificate covering wool recycling, issues TC to spinning mill with each shipment of recycled wool fiber.
2. Spinning mill holds GRS or RCS scope certificate covering yarn spinning, issues TC to the next link (us, as the knitter) with each shipment of yarn, stating recycled content percentage and post- vs pre-consumer split.
3. Knitter (Licheng, when buyers ask us to handle this) — to issue a TC onward to the brand, the knitter must itself be GRS/RCS certified. We are not. So in practice, for buyers requiring a TC to the finished goods, we recommend either (a) the buyer accepts the mill-to-Licheng TC as the proof of input and we forward it with finished goods, or (b) the buyer routes production through a certified knitter for the recycled-content program specifically.
4. Brand uses the TC chain plus the mill scope certificate to defend the on-product claim.
This is the part that surprises most first-time recycled-yarn buyers: the certificate chain breaks at any uncertified link. You cannot legally use the GRS or RCS logo on a finished garment if the finished-goods manufacturer is not itself scope-certified. You can still describe the recycled input factually — "knitted from yarn containing 50% recycled wool, supplier GRS scope certificate available on request" — but the on-pack logo requires an unbroken certified chain.
We say this plainly because the alternative — quietly putting a GRS logo on a hangtag without the chain — is the kind of thing that turns into a regulatory or retailer-audit problem two seasons later.
How To Structure A Recycled-Content PO
If you want recycled-content yarn that survives buyer audit, here is what should be in the PO and tech pack before sampling starts.
Specify the percentage and feedstock split, not just "recycled." Write "50% mechanically recycled wool (minimum 30% post-consumer) / 50% virgin wool" — not "recycled wool blend." The numbers anchor the certificate review.
Require the scope certificate at sample stage. Ask us to forward the spinning mill's scope certificate with the first sample. Confirm the certificate is current (they expire annually), covers the specific fiber type, and is issued by an approved certification body. Search the certificate number on the Textile Exchange certificate database to confirm authenticity.
Require a transaction certificate per bulk order. A TC is issued shipment-by-shipment by the mill's certification body, not by the mill itself. Specify in the PO that bulk production will only ship once the TC for the yarn lot is in hand. Lead time impact is typically a few extra days — not significant, but it has to be planned in.
Match your on-product claim to what the TC actually says. If the TC states 45% recycled wool, the hangtag and product page cannot say 50%. We have seen brands write the rounded-up number in copy and the audited number on the TC, then quietly fix it after a buyer complaint. Avoid the gap.
Decide on logos in advance. If you want the GRS or RCS logo on the finished product, the production chain — including the knitter — must all be scope-certified. If you do not need the logo, the same yarn can be used with a factual recycled-content claim and the mill TC as backup. The yarn is identical; the documentation requirement is different.
We want to be specific about the line. Licheng can: source recycled-content yarns from mills that hold their own GRS or RCS scope certificates when buyers specify the requirement on the PO; forward supplier scope certificates and per-shipment transaction certificates to the buyer; align our internal documentation (yarn receipt records, lot traceability through knitting and finishing) with the mill TC so the buyer's audit trail is complete on our segment.
We do not currently hold our own GRS or RCS scope certificate. We do not make recycled-content claims about Licheng as a company, and we will not issue a TC onward to the buyer. If a buyer's program requires a certified knitter for logo use on finished goods, we will say so during quoting rather than after sampling.
This honesty is deliberate. The recycled-yarn segment has a real problem with overstatement, and the buyers most exposed are the ones who repeated marketing language from somewhere up the chain without checking the certificates underneath. For a DTC brand whose consumer trust depends on the story being defensible, the conservative path — factual claims, mill certificates on file, no logo without a certified chain — is also the safer path.
Recycled-content yarn costs more than virgin equivalent — typically 10-25% more for recycled wool blends, 5-15% more for rPET blends, 15-30% more for recycled cotton blends depending on percentage and feedstock split. Lead times are usually a few days longer because TC issuance is per-shipment and mill MOQs for certified runs tend to be larger than for stock yarn.
For catalog programs at our standard 30 pcs/color MOQ, sourcing certified recycled yarn can push minimum order quantities up because the mill's certified-yarn MOQ may exceed what a 30 pcs/color knit run consumes. We size this up at quoting stage. Sample lead time of 7-25 days and bulk lead time of 30-45 days hold for most recycled-yarn programs once the yarn is in hand; the variable is how quickly the mill can supply against the TC.
None of this is a reason to avoid recycled-content programs — they are increasingly important to European and North American retail buyers, and the documentation infrastructure is workable. It is a reason to plan from the PO forward, with the certificate path drawn in before sampling starts.
