Reference library
Sustainable materials, decoded
What each material actually is, what certifications mean on the label, and the trade-offs greenwashing won't tell you about.
Organic Cotton
Cotton grown without synthetic pesticides or GMOs, certified by GOTS or OCS.
Recycled Polyester (rPET)
Polyester fiber made from recycled PET, usually post-consumer plastic bottles.
Hemp
Fast-growing bast fiber that needs little water, no pesticides, and improves soil.
FSC-Certified Wood
Wood and paper from forests independently certified for sustainable management.
Lyocell (Tencel)
Closed-loop wood-pulp fiber with 99% solvent recovery, silky drape, biodegradable.
Bamboo
Fast-growing grass — sustainable as a raw material, often problematic as fabric.
Recycled Aluminum
Infinitely recyclable metal that uses 95% less energy than virgin production.
Cork
Bark harvested without felling the tree — renewable every 9 years.
The three questions to ask a material
- Where does the raw input come from? Fossil, plant, animal or recycled — each has different upstream costs.
- How is it processed? Closed-loop solvents (lyocell) vs. open-loop chemistry (conventional viscose) is a bigger delta than the fiber itself.
- What happens at end of life? Biodegradable, mechanically recyclable, chemically recyclable — or landfill.
The best material in the abstract loses to the worst material processed well. Certifications and processor transparency are usually a better signal than the fiber name on the label.
Frequently asked about sustainable materials
Is recycled polyester actually sustainable?+
It uses ~59% less energy than virgin polyester and diverts plastic waste, but it still sheds microplastics in the wash. It's a meaningful improvement over virgin PET — not a silver bullet. Pair it with a microfiber-catching laundry bag.
Is bamboo always eco-friendly?+
Bamboo the plant is fast-growing and low-input. Bamboo viscose fabric is chemically intensive to produce, so the sustainability comes down to the mill. Look for closed-loop lyocell-style processing or FSC-certified bamboo.
How can I tell if 'organic cotton' is real?+
Real organic cotton is GOTS or OCS certified with a traceable transaction certificate. If the label just says 'organic' with no certifier, treat it as marketing until proven otherwise.
Which materials should I actively avoid?+
Conventional cotton (heavy pesticide use), virgin polyester and nylon (fossil-derived, microplastic-shedding), PVC (chlorine chemistry), and rayon from unspecified forests. Our per-material pages spell out the trade-offs.
Quick answer
- Recycled polyester uses roughly 59% less energy than virgin polyester
- Organic cotton is only verifiable with a GOTS or OCS certificate number
- Closed-loop lyocell recovers the vast majority of its solvent
- Longevity usually beats material choice: doubling a garment's life halves its per-wear impact
Material trade-offs at a glance
| Material | Main advantage | Main drawback | Check for |
|---|---|---|---|
| Organic cotton | No synthetic pesticides, softer soil impact | High water use, higher price per kilo | GOTS or OCS certificate number |
| Hemp | Low water and input needs, very durable | Coarser hand feel, limited mills | Field-retted or mechanically processed |
| Recycled polyester | Diverts PET waste, big energy saving | Sheds microplastics in every wash | GRS certification and post-consumer content |
| Lyocell / TENCEL | Closed-loop solvent recovery, biodegradable | Wood source can be opaque | Named brand fibre plus FSC/PEFC pulp |
| Bamboo viscose | Fast-growing, low-input crop | Chemically intensive conversion | Closed-loop process, not just 'bamboo' |
| FSC-certified wood | Traceable forestry chain of custody | Says nothing about finishes or glues | FSC chain-of-custody code on the listing |
How to judge a material claim in under a minute
- 1
Find the actual composition
Percentages beat adjectives. '100% organic cotton' and 'organic cotton blend' can be thirty percentage points apart.
- 2
Look for the processing story
For regenerated fibres the mill matters more than the plant. Closed-loop processing is the difference between a good and a bad viscose.
- 3
Match the material to the use
Microplastic shedding matters far more for frequently washed layers than for a backpack that gets rinsed twice a year.
- 4
Weigh it against lifespan
A durable synthetic kept a decade usually beats a fragile natural fibre replaced annually. Construction quality is part of the material decision.
Materials worth avoiding where there is an alternative
Conventional cotton
Among the most pesticide-intensive crops in mainstream use, with no traceability on the finished garment.
Virgin polyester and nylon
Fossil-derived, and identical to recycled versions in shedding behaviour without the waste-diversion benefit.
PVC
Chlorine-based chemistry with problematic plasticisers and poor end-of-life options; usually replaceable with TPU or coated canvas.
Unspecified rayon
Viscose from undisclosed forests remains one of the biggest hidden deforestation risks in consumer goods.
More questions, answered
Is natural always better than synthetic?
No. A synthetic that lasts ten years often has a lower lifetime impact than a natural fibre replaced every season. Durability, care requirements and repairability belong in the comparison.
How do I reduce microplastic shedding?
Wash less often, wash cooler and fuller, and use a filter bag or in-line filter. Shedding is highest in the first several washes of a new synthetic garment.
Does material choice affect the QuickRatey score?
Yes, indirectly. Verified material certifications feed Brand & Trust, while durability and care burden show up in the Quality and Experience pillars.