Microplastics in Clothing: Which Fabrics Are the Problem (and Which Aren't)

Every time a synthetic garment goes through a wash cycle, it sheds thousands of microscopic plastic fibres into the water. These fibres — too small to be filtered by wastewater treatment plants — flow into rivers, lakes, and oceans, where they accumulate in marine ecosystems, enter the food chain, and have been detected in drinking water, human blood, and even lung tissue.

Microplastic pollution from clothing is one of the less visible environmental problems with fashion, but researchers now estimate it accounts for 35% of primary microplastics released into the environment globally. Understanding which fabrics are the worst offenders — and which genuinely reduce the problem — is one of the most practical things you can do as a conscious shopper.

What Are Microplastics?

Microplastics are plastic fragments or fibres smaller than 5mm in size. In the context of clothing, the relevant type is microfibres — tiny filaments that break off from synthetic fabrics during wear and washing. They're too small to see and too fine to be captured by standard wastewater filtration, and have been found in Arctic sea ice, deep ocean sediment, tap water, and human blood. A single wash of a fleece jacket can release over 700,000 microplastic fibres.

Which Fabrics Shed the Most Microplastics?

Polyester — the biggest offender

Polyester is the most widely produced textile fibre in the world and one of the heaviest shedders. Fleece is especially problematic because its raised texture sheds more loose fibres. Virgin polyester is the worst category — made from petroleum, it doesn't biodegrade, and the fibres released persist for centuries.

Nylon, acrylic & blends

Nylon (common in swimwear and activewear) and acrylic (common in knitwear) shed microfibres at similar or higher rates than polyester. Polyester-cotton blends still shed from the synthetic component and are hard to recycle because the fibres can't be separated.

Which Fabrics Shed Fewer Microplastics?

100% organic cotton

Organic cotton doesn't shed microplastics. It's a natural, biodegradable fibre — when it sheds during washing, the cellulose-based fibres biodegrade rather than accumulating as persistent plastic. GOTS-certified organic cotton goes further, requiring no harmful chemical inputs in growing or processing. For everyday clothing — t-shirts, sweatshirts — 100% organic cotton completely avoids the microplastic problem.

Other natural fibres

Linen, wool, hemp, and TENCEL (lyocell) are natural or semi-natural fibres that don't contribute microplastic pollution — they shed biodegradable fibres.

Recycled synthetics (GRS-certified)

Recycled polyester (rPET) and recycled nylon are a more complex case. Recycled synthetics still shed microplastics during washing — the fibres behave like virgin synthetics in garment form. The benefit of GRS-certified recycled material is at the production stage: it uses post-consumer plastic instead of virgin petroleum and diverts waste from landfill. So recycled activewear beats virgin polyester on production, but doesn't solve shedding. More on this in our GRS certification guide.

Does Fabric Construction Matter?

Yes — loosely knit or fluffy fabrics (like fleece) shed far more than tightly woven fabrics of the same material, and older garments shed more than new. But no synthetic fabric eliminates shedding; the only way to avoid it entirely is to choose natural fibres for frequently-washed garments.

How to Reduce Microplastic Shedding

If you already own synthetics (most people do):

• Wash less frequently — every cycle releases fibres; spot-clean where possible.
• Use a microplastic-catching laundry bag (e.g. Guppyfriend) to capture a large share of fibres.
• Wash cool and short — less agitation means less shedding.
• Front-loading washers shed less than top-loaders with an agitator.
• Choose natural fibres for high-wash items — everyday t-shirts and sweatshirts are where organic cotton makes the most difference.

TURTLEGROOVE and the Microplastic Question

Our clothing — embroidered sweatshirts and t-shirts — is made from GOTS-certified 100% organic cotton fibre, so it sheds no microplastics. We don't make synthetic activewear or swimwear, so there's no recycled-polyester garment in our range to shed microfibres (we use recycled-polyester only as embroidery thread). Browse our range:

• Organic Cotton Sweatshirts — GOTS-certified fibre, no microplastic shedding
• Organic Cotton T-Shirts — GOTS-certified fibre, no microplastic shedding

Frequently Asked Questions

Do all synthetic fabrics release microplastics?
Yes. Polyester, nylon, acrylic, and blends containing these fibres all release microplastic fibres during washing. The amount varies by construction, fibre type, and age, but no synthetic fabric completely avoids it.

Does organic cotton shed microplastics?
No. Organic cotton is a natural cellulose fibre; when it sheds during washing, the fibres are biodegradable and don't accumulate as persistent microplastic pollution.

Is recycled polyester better than virgin polyester?
On production, yes — GRS-certified recycled polyester uses post-consumer plastic instead of virgin petroleum. But it still sheds microplastics during washing at similar rates to virgin polyester.

How do I reduce microplastic shedding from clothes I already own?
Wash less often, use a microplastic-catching laundry bag, wash cold and gentle, and use a front-loading washer if possible. Replace worn-out synthetics with natural-fibre alternatives for frequently-washed items.

What percentage of ocean microplastics come from clothing?
Research suggests synthetic textiles account for about 35% of primary microplastics released into the global environment, mostly from washing synthetic garments at home.