PlastfriWhich fabrics shed the most microplastics?
Synthetic fabrics shed plastic microfibers every wash. Acrylic and fleece shed most; tightly woven synthetics shed least; natural fibers shed cellulose, not plastic.
The shedding league table
Wash studies consistently rank acrylic knits and brushed polyester (fleece) at the top — hundreds of thousands of fibers per load. Standard polyester knits shed less; tightly woven nylon shells less again. Natural and cellulosic fibers shed too, but their fibers biodegrade.
About 35% of primary microplastics in the ocean are estimated to come from synthetic textile laundering — the single largest source, ahead of tire dust.
How fibers travel from your washer to the ocean
Every wash flushes broken fibers into wastewater. Treatment plants capture a large share of them — but a share of billions is still enormous, and the captured fibers don’t vanish: they concentrate in sewage sludge, which in many countries is spread on farmland, returning the plastic to soil and, via runoff, to rivers anyway.
Fibers that escape treatment flow to rivers and the sea, where they are eaten by plankton and filter feeders and work up the food chain. Shedding doesn’t stop at the washer, either: synthetic garments release fibers into the air as you wear them, and tumble dryers vent fibers outdoors with their exhaust.
The wash-day playbook
For the synthetics you already own, the goal is friction reduction. Wash less often — airing a fleece usually does the job. Wash cold and short: hot, long cycles shed more. Wash full loads, so garments rub the water, not each other. Prefer liquid detergent over abrasive powders, and skip the tumble dryer — air-drying sheds essentially nothing and extends garment life.
Capture what still sheds. Fiber-catching wash bags hold synthetics while letting water through; external washing-machine filters capture a large share of fibers (commonly cited around 78–90% depending on model), and France now mandates filters on new machines. Empty bag or filter into the trash, never the sink.
What to check before you buy
The composition line predicts shedding better than any marketing claim. For high-frequency-wash items — tees, underwear, socks, bedding, towels — natural fibers eliminate plastic shedding entirely. Where you genuinely need synthetics (rain shells, swimwear), prefer tightly woven constructions over brushed or fluffy ones, and plan to wash them rarely.
Beware of proxies: “eco”, “recycled”, and “vegan” say nothing about shedding. Recycled polyester sheds like virgin polyester; plant-based marketing often sits on top of a mostly-synthetic blend. The percentages are the truth.
Can shed fibers be cleaned up?
Not realistically. Once fibers reach water they disperse at a scale no cleanup technology addresses — remediation of microplastic pollution is effectively impossible with current methods, which is why every serious intervention targets the source: fabric choice, wash behavior, and filtration.
That is also the honest case for caring about the purchase moment. A garment’s total lifetime shedding is largely decided the day you buy it.
Where Plastfri fits
Plastfri makes plastic content visible at the moment of purchase — the only moment you have full choice. The score badge tells you what a product will shed for the rest of its life.
The scoring is deliberately simple: each fiber carries a plastic weight, and the product score is the percentage-weighted share. High-shedding fabric families like fleece and microfiber are exactly the ones that score 100.
Common questions
Do washing machine filters work?
External filters capture a large share of fibers (commonly cited around 78–90% depending on model). France now mandates filters on new machines.
Are microplastics actually harmful to humans?
They have been found in blood, lungs, and placentas. Long-term health effects are still being established — the science is young, but the exposure is universal and rising.
Do clothes shed microplastics just from wearing them?
Yes — friction during wear releases fibers into the air. Washing remains the biggest single release event, but wear and tumble-drying contribute too.
Do natural fibers shed microfibers too?
Yes, but cellulose and protein fibers biodegrade in water rather than persisting. Dyes and finishes on any fiber are a separate, smaller concern.
Which single change reduces shedding most?
Buying natural fibers for the things you wash most often. After that: washing synthetics less, colder, and in a filter bag.
Does dry cleaning avoid the problem?
It avoids your home washer, but it is a solvent process with its own footprint and is impractical for everyday items. Fiber choice at purchase remains the better lever.
Plastfri spots microplastics for you. Scores every product while you shop — covers, dims, or labels the high-plastic ones.
Score a product — free