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.