Not all fabrics are created equal. Some are quietly poisoning waterways, burning fossil fuels, and shedding microplastics into your dinner. Others are basically just plants. We ranked 10 of the most common fabrics from environmental nightmare to genuinely sustainable — backed by real numbers, not vibes.
If you've ever stood in a fast-fashion store wondering whether that £12 jumper is destroying the planet (spoiler: probably), this is the guide for you. We looked at carbon emissions, water use, microplastic shedding, biodegradability, and chemical processing to build this ranking.
Let's start at the bottom.
The Ranking: Worst to Best
#1 Acrylic — The Microplastic King
Acrylic is the undisputed champion of making the ocean worse. Derived entirely from petroleum, it sheds more microplastic fibres per wash cycle than any other fabric — by a landslide. Those fuzzy fleeces and chunky knit scarves? Each wash sends hundreds of thousands of tiny plastic particles straight through your washing machine filter and into waterways. It's also non-biodegradable and energy-intensive to produce. Acrylic is, frankly, the fabric equivalent of littering on an industrial scale.
730,000 microplastic particles shed per wash
#2 Nylon — The Climate Bomb
Nylon's dirty secret isn't just that it's plastic — it's the gas it creates during production. Manufacturing nylon releases nitrous oxide, a greenhouse gas that traps 310 times more heat than carbon dioxide. Add in the enormous energy required to produce it and its complete resistance to biodegradation, and you've got a fabric that punches well above its weight in climate damage. Your "performance" leggings are performing alright — performing environmental destruction.
Nitrous oxide is 310x more potent than CO2
#3 Virgin Polyester — The Oil Guzzler
The world's most popular fabric is also one of its most destructive. Virgin polyester is made directly from crude oil, and the fashion industry alone burns through roughly 70 million barrels of it every year just to keep us in cheap t-shirts. It doesn't biodegrade — that polyester dress you donated to charity will still exist in a landfill two centuries from now. And yes, it sheds microplastics too. It's everywhere because it's cheap, not because it's good.
70 million barrels of oil consumed per year · 200+ years to decompose
#4 Conventional Cotton — The Thirsty Pesticide Sponge
Cotton gets a free pass because it's "natural." It shouldn't. Conventional cotton farming uses more pesticides than almost any other crop — about 16% of the world's insecticides despite occupying just 2.4% of arable land. And the water consumption is staggering. Growing enough cotton for a single pair of jeans requires around 10,000 litres of water. That's not a typo. The Aral Sea didn't drain itself. On the plus side, at least cotton biodegrades. But the production process? An ecological disaster.
~10,000 litres of water per pair of jeans
#5 Viscose — The Deforestation Dress
Viscose (also sold as rayon) sounds eco-friendly because it comes from wood pulp. The reality is messier. Producing viscose involves dissolving cellulose in toxic chemicals like carbon disulphide, which is hazardous to factory workers and pollutes surrounding waterways. Worse, a significant portion of viscose production sources wood from ancient and endangered forests. It's a "natural" fabric with a distinctly unnatural production chain. Around 30% of viscose raw material comes from endangered forests.
30% of viscose pulp linked to endangered forest destruction
#6 Recycled Polyester — The Well-Meaning Compromise
Recycled polyester sounds like the answer. Turn plastic bottles into activewear — genius, right? Not quite. It still sheds microplastics when washed (the recycling doesn't fix the shedding problem), and turning bottles into fabric actually removes them from the bottle-to-bottle recycling loop where they'd be more useful. The production is less energy-intensive than virgin polyester — about 59% less energy — so it's genuinely better. But "better than terrible" is a low bar, and brands love to greenwash with it.
59% less energy than virgin polyester — still sheds microplastics
#7 Organic Cotton — Better, Not Perfect
Organic cotton eliminates the pesticide problem and uses non-GMO seeds, which is a genuine improvement over conventional cotton. It uses 91% less water from blue water sources (rivers, lakes) and produces 46% fewer carbon emissions. But it still needs a lot of water overall, and yields are lower, which means more land is needed to produce the same amount of fibre. It's a solid mid-tier choice — dramatically better than conventional cotton, but the "sustainable fabric" crown belongs elsewhere.
91% less blue water usage vs. conventional cotton
#8 Lyocell / Tencel — The Closed-Loop Star
Lyocell (branded as Tencel by Lenzing) is what viscose should have been. It's made from wood pulp too, but uses a closed-loop process that recovers and reuses 99% of the solvent. The solvent itself (NMMO) is non-toxic. It sources from sustainably managed eucalyptus plantations, uses far less water than cotton, and the resulting fabric is fully biodegradable. It's not perfect — there's still an energy cost — but as manufactured fibres go, it's about as clean as it gets.
99% solvent recovery in closed-loop production
#9 Linen — The Quiet Overachiever
Linen comes from the flax plant, which grows happily in poor soil with minimal water and virtually no pesticides. The entire plant gets used — nothing wasted. It's naturally biodegradable, incredibly durable (linen garments can last decades), and gets softer with every wash instead of falling apart. The production process is low-energy and low-impact. The only reason it's not number one? Hemp just edges it out on versatility and yield. But linen is about as close to guilt-free fashion as you can get.
Needs 6.4 litres of water per kg vs. cotton's 10,000+ litres per kg
#10 Hemp — The Sustainable MVP
Hemp is the most sustainable textile crop on the planet, and it's not particularly close. It grows fast, needs almost no water, requires zero pesticides, and actually improves soil health as it grows (it's a natural remediator). It produces 250% more fibre per acre than cotton and 600% more than flax. The resulting fabric is antimicrobial, UV-resistant, biodegradable, and gets stronger over time. The only reason hemp isn't everywhere already is decades of legal restrictions that are finally being lifted. Give it time.
Produces 250% more fibre per acre than cotton
So What Do You Actually Do With This?
You don't need to throw out your entire wardrobe (please don't — that's also wasteful). But you can start making better choices. Check the label. Favour linen, hemp, and lyocell. Be skeptical of recycled polyester marketing. And avoid acrylic like the environmental plague it is.
Or better yet — install Fibr and let us show you exactly what's in every garment on Zara, H&M, and Mango before you buy. No label-squinting required.