Sustainable Fabric Guide: From Best to Worst
A practical, ranked guide to clothing fibers — what they're made of, what they impact, and which actually live up to the marketing.
Key takeaways
- 1.Tencel, linen, hemp and recycled fibres lead on footprint.
- 2.Conventional cotton and virgin synthetics sit at the bottom.
- 3.Synthetics shed microplastics — wash cold, wash less, use a filter bag.
- 4.Longevity beats fibre choice in almost every comparison.
Best in class
Recycled polyester (rPET): made from post-consumer plastic, ~50% less energy than virgin. Sheds microplastics; pair with a Guppyfriend bag.
Tencel / lyocell: closed-loop solvent process, FSC-certified eucalyptus. Soft, biodegradable, low water use.
Organic linen and organic hemp: rain-fed, minimal pesticides, biodegradable. Heavier carbon cost to spin but long-lasting.
Mid-tier
Organic cotton: GOTS-certified means no synthetic pesticides and audited social standards. Water-intensive but far cleaner than conventional cotton.
Recycled cotton: lower-quality fiber, usually blended. Saves significant water vs virgin.
Recycled wool: gives discarded wool a second life with minimal new shearing.
Avoid where possible
Conventional cotton: 16% of global insecticide use on 2.5% of cropland.
Virgin polyester, nylon, acrylic: fossil-derived, microplastic shedding, energy-intensive.
Conventional viscose / rayon: linked to ancient-forest deforestation unless FSC-certified.
Virgin leather: high carbon footprint, water use, and animal-welfare concerns. Plant-based and recycled alternatives are improving.
The most ethical fiber
The one you already own. Cost-per-wear math beats fiber choice almost every time — a $200 garment worn 200 times costs $1/wear; a $20 garment worn 5 times costs $4/wear.
Frequently asked questions
Is bamboo fabric sustainable?+
Bamboo grows fast, but most bamboo fabric is viscose made with harsh solvents. Look for closed-loop lyocell processing or bamboo linen rather than generic bamboo viscose.
Is recycled polyester actually better?+
It uses less energy and diverts plastic, but it still sheds microfibres and is rarely recycled again. Better than virgin polyester, worse than natural fibres for end of life.