Sourced reference · verified 14 September 2026 · materials
Is recycled polyester sustainable?
It displaces virgin fossil feedstock, which is real. It is also 98% made from bottles rather than textiles, its share of polyester fell last year, and the evidence on microfibre release runs against it.
Recycled polyester is better than virgin polyester on the one measure most people mean — it uses less new fossil input. But almost none of it is made from old clothing. Textile Exchange puts bottle-derived feedstock at 98% of recycled polyester in 2024, which means a garment labelled recycled has usually taken PET out of a loop where it could have been recycled repeatedly and placed it in one where it cannot be recycled again.
The market
The share went down while the volume went up
Figures from the Textile Exchange Materials Market Report 2025, covering the 2024 production year.
- Global fiber production, 2024
- 132 million tonnes
- Up from roughly 125 million tonnes in 2023.
- Polyester share of all fiber
- 59%
- Of which 88% is fossil-based.
- Recycled polyester volume, 2024
- 9.3 million tonnes
- Up from about 8.9 million tonnes in 2023.
- Recycled share of all polyester
- 12%
- Down from 12.5% in 2023 — the share fell while the volume rose.
- Made from plastic bottles
- 98%
- Leaving under 2% from textile-to-textile recycling.
- Global fiber from recycled textiles
- Under 1%
- Pre- and post-consumer combined, across all fiber types.
Feedstock
A bottle becomes a shirt, once
PET bottle recycling is close to a genuine loop: a bottle can become a bottle repeatedly. Fiber is the exit. A garment made from recycled PET is dyed, finished and usually blended, there is no collection infrastructure to take it back, and textile-to-textile recycling remains under 2% of recycled polyester feedstock.
So the honest description of most recycled polyester is not circular. It is one additional journey for material that then leaves the system. That is not nothing — it is a real displacement of virgin input — but it is not what the word recycled is usually taken to promise on a hangtag.
Shedding
One study, and how to cite it
Research by the Microplastic Research Group at Çukurova University, commissioned by the Changing Markets Foundation and published December 2025. Fifty-one garments from five brands, tested on GyroWash and Wascator systems.
| Measure | Recycled polyester | Virgin polyester | Difference |
|---|---|---|---|
| Fibers released per gram | ≈12,000 | 8,028 | 54.8% more |
| Excluding one brand’s samples | — | — | 72% more |
| Mass lost per gram | 0.36 mg | 0.24 mg | 50% more |
| Average fiber length | 0.42 mm | 0.52 mm | shorter, so harder to filter |
Certification
What GRS and RCS do and do not cover
Both standards verify recycled content and chain of custody. The Recycled Claim Standard covers content and custody only, from 20% recycled content. The Global Recycled Standard adds social, environmental and chemical requirements in processing, and requires 50% for consumer-facing labelling or 20% for business-to-business use.
Neither assesses microfibre release, and neither distinguishes bottle feedstock from textile feedstock. A garment can be fully GRS certified and still be bottle-derived, high-shedding, and unrecyclable at end of life — with every claim on the label true.
Questions
Is recycled polyester better than virgin polyester?
On feedstock, yes — it displaces virgin fossil input. On end-of-life and microfibre release, the picture is less favorable. Around 98% of recycled polyester is made from plastic bottles rather than textiles, so it takes PET out of bottle-to-bottle recycling and turns it into a garment that will not be recycled again, and one 2025 study found recycled polyester shed materially more microfibre than virgin polyester in controlled washing.
Where does recycled polyester come from?
Overwhelmingly from post-consumer PET bottles. Textile Exchange reports that recycled polyester was still about 98% bottle-derived in 2024, leaving under 2% from textile-to-textile recycling. Less than 1% of the entire global fiber market came from pre- and post-consumer recycled textiles.
Is recycled polyester actually recycling?
It is, but in one direction only. A bottle recycled into a bottle can be recycled again. A bottle recycled into fabric generally cannot — the garment is a blend, it is dyed and finished, and no collection system exists to take it back. That is downcycling: the material makes one further useful journey and then leaves the loop.
Is recycled polyester use growing?
Its volume is growing and its share is not. Recycled polyester rose from roughly 8.9 to 9.3 million tonnes between 2023 and 2024, but as a proportion of all polyester it fell from 12.5% to 12%, because total polyester production grew faster than the recycled portion.
Does recycled polyester shed more microplastic?
One 2025 study found that it did. Research by the Microplastic Research Group at Çukurova University, commissioned by the Changing Markets Foundation, tested 51 garments from five brands in controlled washing and measured about 12,000 fibers per gram from recycled polyester against 8,028 from virgin — roughly 55% more — with 50% greater mass loss. It is a single commissioned study and should be cited as one.
What does a GRS or RCS label prove about recycled polyester?
That a stated proportion of recycled input is present and that chain of custody was tracked. The Recycled Claim Standard covers content and custody only, from 20% recycled content. The Global Recycled Standard adds social, environmental and chemical requirements in processing and requires 50% for consumer-facing claims. Neither assesses microfibre release, and neither says whether the feedstock was a bottle or a garment.
Method
What this page does not settle
Open items
- Emissions comparison. No verified figure for the greenhouse gas difference between recycled and virgin polyester is asserted here. Published ranges vary widely with assumptions about energy mix and allocation method, and no single primary source was identified that would survive being quoted.
- Whether bottle diversion harms bottle recycling. Argued in both directions and contingent on local collection rates. No primary evidence was located that settles it.
- Replication of the shedding result. One study is reported above. Whether independent laboratories reproduce the gap is not established.
- Chemical recycling. Depolymerisation routes could make textile-to-textile viable at scale. Current deployment is small and no production figure is asserted.
Sources
- Textile Exchange, Materials Market Report 2025 — production volumes, shares and feedstock split for 2024. textileexchange.org
- Changing Markets Foundation, Spinning Greenwash, December 2025 — microfibre testing by the Microplastic Research Group, Çukurova University. changingmarkets.org
Market figures are taken from Textile Exchange's own reporting of the 2024 production year. The shedding figures are reported with their commissioning body, research group, method and sample size attached, because the qualification is part of the finding.
Sources verified 14 September 2026.