Polyester
The most common synthetic fabric
Also seen as: PET fabric, polyethylene terephthalate, synthetic fibre, microfiber fleece
At a glance
Polyester is one of the most common textiles in the world — durable, cheap, wrinkle-resistant, quick-drying. It's also a major source of microfibres in waterways and household dust. The main practical concerns are shedding (washing releases microfibres), heat trapping, sweat issues for sensitive skin, and chemical finishes (wrinkle-resistant, stain-resistant treatments) that may include PFAS, formaldehyde releasers, or other additives.
Quick facts
- What it isSynthetic fibre, usually PET-based
- Main jobCheap, durable, quick-drying clothing and home textiles
- How exposure happensSkin contact, inhalation (microfibres in indoor air), washing-machine wastewater release into the environment
- Most relevant forSensitive skin, eczema, microfibre-conscious households, kids' sleepwear
- Easy to spot?Yes — fibre composition is on garment labels by law
- US snapshotFibre labelling required; specific finishes (flame retardant, stain-resistant) may use restricted chemicals.
- EU snapshotREACH covers chemical finishes; mandatory fibre labelling.
- Global contextPolyester is the most-produced synthetic fibre globally. Microplastic shedding is a major active research area.
Where it commonly shows up
- Personal CareLess common
- Cosmetics & MakeupLess common
- Oral CareRare
- Baby & KidsSleepwear, Onesies, Soft toys, Bedding, School uniforms
- Kitchen & FoodDishcloths (microfibre), Tea towels, Reusable bags
- Cleaning & LaundryMicrofibre cleaning cloths, Mop heads, Sponges (some)
- Clothing & TextilesT-shirts, Activewear, Fleece, Linings, Stockings, Pillows
- Home & LivingCarpets, Rugs, Curtains, Cushions, Mattress toppers, Bedding
- Other Daily ItemsReusable shopping bags, Backpacks, Tents, Umbrellas
What to do about it
Wash new polyester items before first wear, and run a washing-machine fibre filter or filter bag (Cora Ball, Guppyfriend) to catch microfibres.
Better choices
- Natural fibres (cotton, linen, wool, hemp) where they suit the use case
- Recycled polyester where polyester is the right choice — same shedding profile but lower upstream impact
- A washing-machine filter to catch microfibres from synthetic laundry
Common questions
Each answer is tagged with how settled the evidence is: Established, Estimate, or To check.
What is polyester in simple terms?Established
Polyester is a synthetic fibre made from petroleum-based polymers — usually PET, the same plastic in clear drink bottles. It's spun into thread, woven into fabric, and used in clothing, home textiles, and industrial products. About half of all global fibre production is polyester.
Why is it used in everyday products?Established
Cheap to produce, doesn't wrinkle, dries fast, holds colour well, durable, holds shape. For activewear, it wicks sweat. For fleece, it's warm and lightweight. For carpets and curtains, it's hard-wearing.
What names does it go by on labels?Established
Polyester, PET, polyethylene terephthalate, microfiber, microfleece, PolarTec, Dacron, Trevira. Recycled polyester is sometimes labelled rPET or "recycled PET."
Where do we commonly find it at home?Established
Most synthetic clothing, fleece, sportswear, bedding, curtains, carpets, cushions, microfibre cloths, soft toys, and reusable bags. If a textile doesn't say cotton, wool, linen, or hemp, it's probably polyester or a polyester blend.
How does exposure happen?Established
Three routes. Skin contact while wearing clothes. Microfibres inhaled from indoor dust (washing machines and dryers release fibres into the home as well as wastewater). And — for items with chemical finishes — exposure to whatever finishing chemicals were used (water repellents, flame retardants, anti-wrinkle treatments).
How does it affect women, especially during pregnancy?Estimate
The fibre itself is low concern. Concerns route through chemical finishes (PFAS waterproofing, formaldehyde anti-wrinkle treatments) and through microfibre exposure, which is an active area of microplastic research. Washing new clothes before first wear removes some finishing residue.
How does it affect men's health and fertility?Estimate
Same finish-driven concerns. Tight synthetic underwear and activewear can also trap heat against the body, which has been studied (modestly) for sperm quality effects — the signal is small but real for tight prolonged wear.
How does it affect babies, children, and teenagers?Estimate
Kids' sleepwear in many countries must meet flame-resistance rules, which historically meant chemical flame retardants in synthetic fabrics. Today, many polyester children's pyjamas pass the test via the polyester itself without added retardants — but check labels. Also: more time on synthetic carpet means more microfibre dust exposure for crawlers and toddlers.
Does it affect older adults differently?To Check
No specific age-related signal. Skin sensitivity varies more than anything else.
What does the strongest evidence say?Established
Strongest evidence is for microfibre release from washing — a single wash of a synthetic garment can release hundreds of thousands of fibres into wastewater. The human health impact of inhaled and ingested microfibres is still actively studied; environmental impact is well established. Chemical finishes have their own evidence bases (covered in the Chemicals section).
How serious is the risk from normal daily use?Estimate
Low to moderate for the fibre itself. Higher when finishes are involved (stain-resistant treatments on carpets, flame retardants on bedding, anti-wrinkle on shirts). Microfibre concerns are environmental more than acute personal — but the inhalation route is the open question.
What are safer alternatives?Established
Cotton (especially organic), linen, hemp, and wool for clothing and bedding. Wool for outerwear (warm, naturally water-resistant, no shedding plastic). Tencel/lyocell for soft synthetics-alternative fabric. Natural fibre carpets if you're replacing flooring.
How easy or hard is it to avoid?Estimate
Hard to avoid entirely — polyester is everywhere. Easy to reduce: prioritise cotton/wool for items worn against skin overnight (bedding, sleepwear) and for kids. Catch microfibres with a washing machine filter — single best lever.
What's one simple first step right now?To Check
Buy a washing-machine microfibre filter or filter bag. About $30 one-time cost, captures fibres from every synthetic load you wash. Most impactful single action for polyester.
What this means for youEstimate
Polyester isn't the worst thing you wear, but it's everywhere, and the microfibre angle is real. The priorities: natural fibres for sleepwear and bedding (especially for kids), a microfibre filter for the washing machine, and skip stain-resistant treatments on furniture and carpets when buying new.
Where can I find reliable information?To Check
Research on textile microfibres (PMC), Plastic Soup Foundation, and academic reviews on synthetic fibre shedding. See References below.
Related guides
MicroplasticsFormaldehyde ReleasersFragrance CompoundsPFAS / Fluorinated ChemicalsOptical BrightenersAntimicrobial Finishes / Silver AgentsNonylphenols / Alkylphenol EthoxylatesAntimonyPlasticNylonAcrylic FabricSpandexPET / PETERecycled Polyester (rPET)CottonWoolCarpet & Carpet BackingWaterproof Coated TextilesStain ResistantWaterproofFlame ResistantWrinkle Free / Easy Care / Non-IronOEKO-TEX Certified
Sources
Micro Detox is an educational exposure reduction guide. It is not medical advice and does not diagnose, treat, prevent, or cure any condition. If you are pregnant, trying to conceive, or managing symptoms, speak with a qualified health professional.
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