Material Guide: How Sustainable is Polyester?

By September 17, 2018Material Guides

If you’re concerned about the environmental impact of fashion, you probably spend some time reading garment tags to find out what your clothes are made of. When looking at labels it doesn’t take a magnifying glass to notice that one fabric comes up more than most: polyester. Considering its prevalence it is important to know exactly what you’ve got rubbing against your skin. We ask the question, how sustainable is polyester?

When did polyester first arrive on the scene?

Polyester fabric hasn’t been around forever. Our grandparents were clothed in natural materials such as wool, linen and cotton and in fact, by the end of World World II, the latter accounted for over 80% of fibre consumed.

With chemical advances in the 1940s man-made fibres were introduced, and so began a gradual shift away from cotton, turning towards cheaper and faster to produce textiles. Nowadays, polyester dominates the clothing industry, with annual production exceeding 22.67 billion tonnes worldwide.

So what exactly is polyester?

The term ‘polyester’ describes a category of polymers produced by mixing ethylene glycol (derived from petroleum) and terephthalic acid.

Putting aside the chemical jargon, polyester is a common plastic with a wide application that includes and extends beyond the fashion industry.

It ranks behind polyethylene (i.e. packaging and water bottles) and polypropylene (i.e. ropes, stationary and Australian bank notes) as the most commonly used plastic.

The impacts of Polyester on the Planet and People

Polyester is not biodegradable

The majority of polyesters are not biodegradable meaning that the polyester fabric shirt you bought last season will not decompose for 20 years at best and 200 years at worst, depending on conditions.

What’s more, polyester is, in part, derived from petroleum and the oil manufacturing industry is the world’s largest pollutant.

Polyester dyes are not environmentally friendly

Ever noticed how polyester fabrics are stain resistant? That’s because it takes a special kind of dye to successfully colour polyester. These dyes, known as disperse dyes, are insoluble in water and, like polyester, are made up of a complex molecular structure that does not readily decompose.

Waste water from textile factories containing leftover dye is difficult to treat and, as such, enters the environment where its toxicity causes serious problems to plant and animal life.

In addition to causing environmental problems, polyester dyes are also toxic to humans. Dye workers worldwide report higher incidences of cancers and lung disease than the general population.

Polyester manufacturing is water-thirsty

Polyester is created through an energy-intensive heating process, requiring large quantities of water for cooling. If not managed properly this can result in groundwater levels dropping and reduced access to clean drinking water, particularly in vulnerable communities where polyester is often manufactured.

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What about recycled polyester?

In the past few years, the sustainable fashion sphere has been introduced to recycled polyester. Recycled polyester is usually made from recycled plastic bottles, like in this jacket by Patagonia GoY-Ratings_4.  Buying recycled polyester means you’re minimising waste and cutting out the fossil fuel industry.

Be careful with fleeces though.  Studies have shown that these plastic microfibres are polluting waterways at an alarming rate. And that fleece made from recycled polyester may be more polluting than its original form.

More on those microfibres

Multiple studies have shown synthetic fibers to make up a good share of microplastics found in waters and are widely implicated as the source of pollution. In fact, it’s been suggested that more than 4,500 fibers can be released per gram of clothing per wash, according to the Plastic Soup Foundation.

Microfibers are so tiny they can easily move through sewage treatment plants. They do not biodegrade and bind with molecules from harmful chemicals found in wastewater. They are then eaten by small fishes and plankton, concentrating toxins and going up the food chain, until they reach us. The consequences on the human body have yet to be researched and revealed.

What can we do?

  1. Look for garments that are made from natural fibres, like organic cotton, and coloured using natural dyes.
  2. Choose well, buy less. Garments made with natural fibres have their own ethical considerations. Cotton is one of the thirstiest and dirtiest fabrics, though organic cotton fares considerably better. The wool industry has sometimes been criticised for its use of unethical practices. By choosing well and buying less, you’re helping to avoid the unsustainable over-production of fibres at a cost to the environment and the world’s most vulnerable people.
  3. Buy from op-shops. An even better option to buying fewer new things is to buy more pre-loved garments from secondhand stores. Since polyester garments are both common and durable, you will find plenty recycled items in thrift shops that show few signs of wear and tear and will stand the test of time.
  4. Wash less and wash better. Solutions are starting to appear to avoid microfibres to be shed during washing such special laundry bags and laundry balls.
  5. Get informed and choose brands with policies that protect and respect the planet and the people making their products. The Good On You app helps you uncover brands who perform better on the issues you care about.

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Editor’s note: this article was updated in August 2018. Feature image by Photo by Pete Bellis on Unsplash. Image is public domain. Photo by Jonathan Percy on Unsplash, Patagonia, Jeremy Bishop on Unsplash.

Ashlee Uren

Author Ashlee Uren

Ashlee Uren tries to wear the change she wants to see in the world. Her love for ethical shopping stems from her passionate belief that the actions of individuals can be incredibly powerful in positively impacting the world. Ashlee holds a double degree in Law and International Relations and in her spare time enjoys blogging about her ethical lifestyle journey at

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Join the discussion 7 Comments

  • Jamie says:

    thank you so much for this valuable info…. much appreciated will dl the app as well.

  • hanita says:

    Hi Ashlee,
    I’ve read this article and the other one about sustainability of nylon. So my question is this, what about recycled polyester? Is it also that bad? What is more green, recycled polyester or recylced nylon?


    • Ashlee Uren Ashlee Uren says:

      Hi Hanita

      Thank you for reading the articles and for your question.

      I think the question of polyester/nylon sustainability has three considerations: 1. the production stage (production of nyclon and polyester is highly polluting and energy intensive); 2. the use stage (we know the washing of polyester contributes to release of microplastics into oceans); 3. the disposal stage (we also know polyester and nylon are not biodegradable).

      For me, the question of the sustainability of recycled polyester/nylon also depends on this stages. It is definitely a positive for the disposal stage, since it avoids plastic going to landfill. It depends on the producer and recyling process, but in general the recycling process is less polluting than creating virgin-polyester or nylon. You can always improve the sustainability of the use stage by using a plastics filter in the wash and washing your clothes less.

      I hope this helps!


  • Pelin says:

    I came across your website while searching whether a certain brand was ethical or not. Thank you for sharing great info.
    I have some garments made from polyester that I purchased a long time ago, and they seem to be holding better than some of the 100% cotton t-shirts I bought. I guess the only way to make the already bought polyester clothing sustainable is to wear them for a longer period of time.

    • says:

      Hi – definitely get the most out of your already bought polyester items before sending them to landfill. Who knows if you hang on to them long enough there might even be a viable recycling system for them! Let’s hope it happens soon.

  • Michelle Altman says:

    I am looking for more information on why wearing 100% polyester is bad for your health. I work for a city in South Florida and they have us wearing 100% polyester and the temp. at times reach 95* without humidity. least to say we all have been complaining and was told its what we have to wear…. UGH! Would you happen to know of any other avenues I can look at or know of someone I can reach out to here in S. Florida that may have more resources for me to fight the battle of getting out of these shirt. we are the only crew out of the entire city that is wearing them. might I add they are hightlighter yellow with reflective tape.

    Thank You

    • Ashlee Uren Ashlee Uren says:

      Hi Michelle

      Unfortunately, I’m not a scientist, but I can give you some tips on where to start. There are two main ways that wearing polyester could be bad for your health. 1. Polyester and other synthetic fabrics are often treated with numerous chemicals. Your skin is the largest organ and so is susceptible to absorbing these chemicals. 2. Polyester is not a breathable fabric so in the heat and humidity it will trap the heat and contributing to bacterial growth. This article by ScienceDaily summarises a Stockholm University study on the issue:

      I hope this helps!


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