Polyester is the same plastic as a drinks bottle, spun into thread. It accounted for 59 per cent of the 139 million tonnes of fibre produced in 2025, and 88 per cent of that polyester was virgin fossil-based. What it does well, and what it does not.
Polyester is a synthetic fibre made by melting a plastic, usually polyethylene terephthalate, and extruding it into filaments. It is chemically the same material as a clear drinks bottle. It accounted for 59 per cent of the 139 million tonnes of fibre the world produced in 2025, which makes it, by a wide margin, the most used textile fibre on earth.
How is polyester made?
From oil and gas, in most cases.
Two petrochemical feedstocks are reacted to produce polyethylene terephthalate, the polymer usually shortened to PET. The polymer is melted and pushed through a spinneret, a plate with fine holes, which produces continuous filaments. Those are cooled, drawn to align the molecules and build strength, and then either kept as filament yarn or cut into short lengths called staple to be spun like cotton.
The cutting step is why polyester can feel like completely different fabrics. Filament polyester makes slick, smooth textiles. Staple polyester, spun into yarn, makes fleece, jersey and fabrics that behave more like natural fibres. Same polymer, different construction.
Why is it used in almost everything?
Because it is cheap, strong and dimensionally stable, and those three things are hard to get together.
It does not absorb much water, so it dries fast and does not swell or shrink the way cotton does. It holds a pressed shape, which is why pleats survive washing. It resists stretching and recovers from it. It takes disperse dyes in bright, wash-fast colours. And it is strong enough to be spun very fine, which is what makes technical sportswear possible.
The economics matter as much as the properties. Polyester's price is tied to petrochemical feedstocks rather than to agricultural land, water and harvest, so it is cheaper and far less volatile than cotton.
What is it bad at?
Three things, and they are the reasons people complain about it.
It does not absorb moisture, so it does not take sweat away from the skin by absorption the way cotton does. Sportswear works around this with knit structures that move liquid along the surface, which is engineering rather than a property of the fibre.
It traps odour. Body oils bind to the hydrophobic fibre and ordinary washing removes them less effectively than it removes water-soluble soil from cotton, which is why a synthetic running shirt smells after one wear and a cotton t-shirt does not.
And it melts rather than chars. A hot iron on polyester is permanent, which is why the single-dot iron symbol exists.
It also pills persistently, because the fibre is strong enough that the anchoring fibres holding a pill in place do not break.
How much polyester is actually recycled?
Far less than the marketing implies, and the detail is where this gets interesting.
Textile Exchange's Materials Market Report 2026 found that 72.8 million tonnes of 2025's 82.5 million tonnes of polyester, which is 88 per cent, was virgin fossil-based. The growth in global fibre production came mainly from virgin fossil-based fibres, which rose from 81 to 86 million tonnes.
Textile-to-textile recycling, meaning old clothes made into new fibre, remained at around 1 per cent of all fibre production.
“An estimated 139 million tonnes of fibres were produced in 2025, compared to 132 million tonnes in 2024.”
So the recycled polyester in garments is overwhelmingly not recycled clothing. It is recycled drinks bottles, mechanically reprocessed into fibre.
Is a garment made from recycled bottles a good thing?
Better than virgin for that garment's footprint, and not circular, and those two statements are both true.
PET bottles already have a functioning recycling system in many countries, in which a bottle becomes another bottle, repeatedly. Taking a bottle out of that loop to make a jacket moves the material from a closed loop into an open one, because the jacket is far harder to recycle than the bottle was. It is downcycling with a good story attached.
That does not make it worthless. Using existing PET avoids the extraction and polymerisation of new PET, which is a real saving, and at current volumes the bottle supply is not the binding constraint on anything.
It does mean that recycled content and circularity are different claims, and marketing tends to treat them as the same one. Our guides to sustainable fashion claims and to the rules on greenwashing set out which assertions a brand now has to be able to prove.
How did polyester come to dominate so completely?
By growing while everything else stayed flat.
Cotton production is bounded by land, water and harvest cycles. It reached 25.7 million tonnes in 2025, up slightly from 25.4 million, and held an 18 per cent share. Manmade cellulosics, the viscose and lyocell family, rose from 8.4 to 9.1 million tonnes for 7 per cent.
Polyester went from 77.7 to 82.5 million tonnes in a single year. The increase alone, close to 5 million tonnes, is roughly a fifth of all the cotton grown on earth.
That asymmetry is the whole story of modern textile supply. Demand for clothing has risen faster than agricultural fibre can, and the gap has been filled with petrochemicals. Textile Exchange's figure of 17 kg of fibre per person per year, against 8.3 kg in 1975, is the demand side of the same equation.
Is there any alternative at that scale?
Not currently, and this is the uncomfortable part of the debate.
Natural fibres cannot expand to replace 82.5 million tonnes without land and water use that nobody is proposing. Recycled polyester is constrained by feedstock and by the fact that textile-to-textile recycling sits at around 1 per cent of production. Bio-based polyesters exist and are a rounding error in volume terms.
So the realistic levers are not substitution. They are using less, which means buying fewer garments and keeping them longer, and using what exists better, which means designing for recyclability rather than for a recycled-content claim. Our explainer on viscose covers the main non-synthetic alternative and why it is not a drop-in replacement either.
What about microfibres?
Polyester sheds plastic fibres in the wash, and that is the environmental objection most specific to this material.
The shedding is mechanical: agitation breaks loose fibre ends off the yarn and they leave with the wastewater, small enough to pass many treatment processes. Fleece and loosely constructed knits shed more than tightly woven fabric, and a new garment sheds most in its first few washes.
Washing less often, washing cooler, using a fuller load, avoiding long aggressive cycles and skipping the dryer all reduce it. Filter bags and in-machine filters capture some of it. None of these solves it, and the fibre itself is not going to change.
How should a shopper read a polyester content label?
Three questions, in descending order of usefulness.
What is it blended with? A cotton-polyester blend gets the strength of one and the absorbency of the other, and loses the recyclability of both, because separating fibres in a blend is the main technical obstacle to textile-to-textile recycling.
How much elastane is with it? Polyester with elastane is normal in sportswear and makes recycling harder still.
And what is the construction? A tightly woven polyester shirt behaves nothing like a brushed polyester fleece, despite an identical content label. Construction decides breathability, shedding and pilling far more than the fibre name does.
The short version
Polyester is cheap, strong, fast-drying plastic thread, and it is 59 per cent of what the world wears. Almost nine tenths of it is still made from new fossil feedstock, and textile-to-textile recycling is around one per cent of all fibre.
The useful consumer position is neither to avoid it nor to accept recycled claims at face value: buy it where its properties genuinely help, keep it for a long time, and wash it as little and as gently as you can.
This article reports published industry data. Figures come from Textile Exchange's Materials Market Report 2026, covering 2025.
Frequently asked questions
What is polyester?
A synthetic fibre made by melting a plastic, usually polyethylene terephthalate, and extruding it through fine holes into filaments. It is chemically the same material as a clear drinks bottle. The filaments are drawn to build strength and then either kept as continuous yarn or cut into short staple lengths and spun like cotton, which is why polyester can feel like completely different fabrics.
How much of the world's clothing is polyester?
Polyester accounted for 59 per cent of global fibre production in 2025, on output of 82.5 million tonnes, according to Textile Exchange's Materials Market Report 2026. That share was unchanged from 2024. Total global fibre production reached a record 139 million tonnes, up from 132 million, which works out at 17 kg of fibre per person per year against 8.3 kg in 1975.
Is polyester bad for the environment?
Its production is fossil-based and it sheds plastic microfibres in the wash, which are the two specific objections. Textile Exchange found 88 per cent of 2025's polyester was virgin fossil-based. Against that, it is durable and light, and a garment kept for years has a lower footprint per wear than a short-lived natural-fibre one. The strongest environmental lever is how long a garment is kept and how it is washed.
Is recycled polyester actually recycled clothing?
Almost never. Textile-to-textile recycling was around 1 per cent of all fibre production in 2025, so recycled polyester in garments is overwhelmingly reprocessed drinks bottles rather than old clothes. That takes PET out of a working bottle-to-bottle loop and converts it into a garment that is harder to recycle again, which is a real saving for that garment and is not circularity.
Why does polyester smell after one wear?
Because body oils bind to the fibre and ordinary washing removes them less effectively than it removes water-soluble soil from cotton. Polyester does not absorb water, so sweat sits on the surface and the oils carrying odour attach to the hydrophobic fibre. This is a property of the material rather than a laundry failure, and it is the main reason synthetic sportswear needs washing more often than cotton.
Does polyester shrink or stretch?
Far less than natural fibres, which is one of its main advantages. It does not absorb much water, so it does not swell and shrink the way cotton does, and it recovers from stretching. That dimensional stability is why pleats and pressed shapes survive washing in polyester and do not in linen. Heat is the exception: polyester melts rather than chars, so a hot iron does permanent damage.
Does polyester pill?
Yes, and persistently. A pill stays attached because some of its fibres are still anchored in the yarn, and polyester fibre is strong enough that those anchors do not break. Wool pills can snap free and fall off; polyester pills do not. Blends of polyester with a weaker natural fibre are a common culprit, because the natural fibre loosens and the synthetic holds the ball in place.
How do you reduce microfibre shedding from polyester?
Wash less often, wash cooler, use a fuller load, avoid long aggressive cycles and skip the dryer. Fleece and loosely constructed knits shed more than tightly woven fabric, and a new garment sheds most in its first few washes. Filter bags and in-machine filters capture some of it. None of these eliminates the problem, and the fibre itself is not going to change.
Is a polyester cotton blend better than pure polyester?
Better to wear, worse to recycle. A blend gets the strength and stability of polyester plus the absorbency of cotton, which is why it dominates workwear and bedding. But separating fibres in a blend is the main technical obstacle to textile-to-textile recycling, so a blend is harder to recycle than either fibre alone. Adding elastane for stretch makes it harder still.
What should I look for on a polyester label?
Three things. What it is blended with, since a blend trades wearability for recyclability. How much elastane is in it, because that makes recycling harder again. And the construction, which matters more than the fibre name: a tightly woven polyester shirt behaves nothing like a brushed polyester fleece despite an identical content label, and construction decides breathability, shedding and pilling.
Sources
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Materials Market Report 2026, Textile Exchange