Is nylon plastic? Yes, and here is exactly why
Yes, nylon is plastic. Its real name is polyamide, a petroleum-based synthetic polymer, the same family of plastic used for fishing line, nets, and toothbrush bristles. To turn it into fabric, that plastic is melted, pushed through tiny holes into fine filaments, and spun into thread. A nylon swimsuit or windbreaker is woven plastic. That is also why it sheds microplastics every wash.
Nylon trips people up because it feels soft and clothing-like, nothing like a fishing line or a plastic clip. But the chemistry is not ambiguous. Below is the plain-English version of what nylon is, how it is made from oil, how it differs from polyester, why plastic in your clothes matters, and what you can wear instead if you want to keep plastic off your skin and out of the water.
Is nylon plastic?
Yes, nylon is plastic, with no asterisk. It is a synthetic polymer called a polyamide, a long chain molecule built by humans from petroleum, and it is the same base plastic used in fishing line, rope, gears, and toothbrush bristles. The textile industry does not dispute this. When a fabric is labeled nylon, the fiber is a plastic drawn out into thread. Calling nylon a fabric and a plastic at the same time is correct, because the plastic is the fabric. Only the shape changes.
What is nylon made of?
Nylon is made from petroleum. Crude oil is refined into chemical building blocks, most commonly caprolactam for nylon 6, or hexamethylenediamine and adipic acid for nylon 6,6, which are reacted together to form the polyamide polymer. That solid plastic is then melted and forced through a spinneret, a metal plate with microscopic holes, to draw out long thin filaments. Those filaments are cooled, stretched, and spun into yarn, which is knitted or woven into cloth. From oil to plastic to thread, no part of it is grown.
Is nylon the same plastic as fishing line?
Close to it. Fishing line, nets, and nylon fabric are all polyamide, the same polymer family. The line is extruded as a thick monofilament; the fabric is spun into fine fibers and knitted into cloth. Same plastic, different form. This is exactly why recycled nylon can be made from reclaimed fishing nets and re-spun into leggings and swimwear so cheaply. The net and the swimsuit were never far apart.
Is nylon the same as polyester?
No, they are two different plastics, though both are petroleum-based and both shed microplastics. Nylon is a polyamide, joined by amide bonds; polyester is PET, joined by ester bonds. In practice nylon is softer, stretchier, and more abrasion resistant, which is why it dominates swimwear, hosiery, and activewear, while polyester dries faster and holds color and shape, which is why it fills everyday tees and fleece. For a plastic-free wardrobe the difference is academic: both start as oil, both end as plastic thread, and both shed. For the full chemistry breakdown on the other plastic, read Is polyester plastic?
Does nylon shed microplastics?
Yes. Because the fiber is plastic, small fragments break off as plastic microfibers during washing and normal wear. Your washing machine rinses them into wastewater, where many pass through treatment and reach rivers and the ocean, and wearing sheds them into the air indoors. Synthetic textiles are one of the largest identified sources of microplastic pollution, and nylon, concentrated in swim and activewear that gets washed frequently, is a major contributor. Our explainer on microplastics in clothing goes deeper on how this happens.
How much does nylon actually shed, and where does it end up?
Nylon sheds less than most synthetics by weight, but less is not none, and the destination is now measurable. A peer-reviewed laundry study measured nylon garments shedding about 27 milligrams of microfiber per kilogram of fabric per wash, roughly six times less than mechanically-treated polyester fleece at about 161 milligrams (Vassilenko et al., 2021, PLOS ONE). It still accumulates: laundering synthetic textiles is estimated to be the single largest source of primary microplastics entering the ocean, about 34.8 percent of the global total, ahead of tyre wear (IUCN, 2017). And these particles are turning up inside people. One 2022 study detected plastic particles in the blood of 17 of 22 healthy adults (Leslie et al., 2022, Environment International), and another found microplastics in 11 of 13 human lung samples, with PET and polypropylene the most common polymers (Jenner et al., 2022, Science of the Total Environment).
So which fabrics are plastic and which are not?
Here is the quick map. The verdict is about the fiber itself, not the marketing on the hang tag.
| Fiber | Plastic? | What it actually is |
|---|---|---|
| Nylon | Yes | Polyamide plastic, petroleum-based, the same polymer as fishing line. Dominates swim and activewear. Sheds microplastics. |
| Polyester | Yes | PET plastic, the same polymer as water bottles, spun into thread. The most common synthetic. Sheds microplastics. |
| Acrylic | Yes | Plastic made to imitate wool. One of the heavier microplastic shedders. |
| Elastane / spandex | Yes | Polyurethane plastic. The hidden stretch in most leggings, swimsuits, and jeans, usually 2 to 25 percent. |
| Cotton, linen, hemp | No | Natural plant fibers. Grown, not refined from oil. No microplastic shedding. |
| Wool, silk | No | Natural protein fibers. Plastic-free. Watch for nylon blended into socks and base layers. |
| Tencel lyocell, modal | No | Regenerated cellulose from plant pulp. Plant-based and sheds no microplastics, but chemically processed. |
| OHZEHN-TEX™ | No, engineered | performance fabric. Builds four-way stretch from bio-based polymers, PFAS-free at the polymer level. |
Is recycled nylon plastic-free?
No. Recycled nylon, including the branded recycled nylon spun from reclaimed fishing nets and fabric scrap, is still nylon, and nylon is still plastic. Reusing waste instead of drilling fresh crude lowers the virgin-oil footprint, which is a real improvement on that single axis. But the finished fiber is the same polyamide polymer and sheds microplastics in the wash exactly like virgin nylon. Recycled content is a recycling claim, not a plastic-free one, and the same trap catches recycled polyester, which we broke down in the recycled polyester microplastics myth.
Related: conventional nylon versus bio-based PA6.10.
Is nylon bad for you to wear?
Nylon is not classed as acutely toxic to have against your skin, and plenty of clothing is safely made from it. The honest concerns are more about comfort and environment than a health emergency. If you want to sidestep both the shedding and much of the finishing-chemistry risk, choosing a plastic-free fiber solves it at the material level.
What can I wear instead of nylon?
Nylon is hardest to replace exactly where it is most common, in swim, hosiery, and stretch activewear, because its softness and rebound historically came from a plastic. For everyday clothing, the plastic-free options are natural fibers like organic cotton, linen, hemp, wool, and silk, or closed-loop regenerated cellulose like Tencel lyocell and modal, which are plant-based and shed no microplastics. For performance, the way out is a plant-derived polyamide that engineers the same rebound from bio-based feedstock such as castor oil instead of crude. For the buyer-side picks, start with the best natural-fiber activewear brands, PFAS-free leggings, and the plastic-free sports bra roundup.
Related: a bio-based nylon option for your line.
The one-line answer to remember
Nylon is plastic. Not plastic-adjacent, not plastic-like: it is polyamide, the same base polymer as fishing line, spun into cloth. Once you know that, the swim tag and the activewear tag read differently. If the fiber-content label says nylon, polyester, acrylic, or elastane, you are wearing plastic, and if it says cotton, linen, hemp, wool, silk, lyocell, or modal, you are not. The nearest neighbor is polyester, which is also plastic. For the full map of what qualifies as plastic-free and how to verify a claim, read our plastic-free clothing guide.
Frequently asked questions
Is nylon plastic?
Yes. Nylon is a plastic. It is a synthetic polymer called a polyamide, the same base plastic used for fishing line, rope, gears, and toothbrush bristles. To make fabric, that plastic is melted, forced through tiny holes to form filaments, and spun into thread. So a nylon swimsuit or windbreaker is plastic drawn out into cloth. Only the shape changes.
What is nylon made of?
Nylon is made from petroleum. Crude oil is refined into chemical building blocks, most often caprolactam for nylon 6, or hexamethylenediamine and adipic acid for nylon 6,6, which react to form the polyamide polymer. That polymer is a plastic. It is melted and extruded into fine fibers, then spun into yarn. Nothing about the fiber is grown or natural; it starts as oil and ends as plastic thread.
Is nylon the same as polyester?
No, they are two different plastics, but both are petroleum-based and both shed microplastics. Nylon is a polyamide, joined by amide bonds; polyester is PET, joined by ester bonds. In practice nylon is softer, stretchier, and more abrasion resistant, so it dominates swimwear, hosiery, and activewear, while polyester dries faster and holds color and shape. For a plastic-free wardrobe the distinction does not matter: both are plastic.
Does nylon shed microplastics?
Yes. Because nylon is plastic, it releases plastic microfibers, tiny fragments of the fiber, every time it is washed and worn. Washing machines flush these microfibers into wastewater and out into waterways, and wearing releases them into the air. Synthetic textiles are one of the largest identified sources of microplastic pollution, and nylon, heavily used in swim and activewear that gets washed often, is a major contributor.
Is recycled nylon plastic-free?
No. Recycled nylon, including the branded recycled nylon spun from reclaimed fishing nets and fabric scrap, is still nylon, and nylon is still plastic. Reusing waste instead of drilling fresh oil lowers the virgin-petroleum footprint, which is a genuine win on that one axis. But the finished fiber is the same polyamide plastic and sheds microplastics in the wash just like virgin nylon. Recycled content is a recycling claim, not a plastic-free claim.
Is nylon bad for you to wear?
Nylon is not classed as acutely toxic to wear, but there are real reasons to limit it. Natural and plant-derived fibers avoid the shedding and much of the finishing-chemistry risk at the material level.
What can I wear instead of nylon?
For everyday clothing, natural fibers like organic cotton, linen, hemp, wool, and silk are bio-based, and closed-loop regenerated cellulose like Tencel lyocell and modal is plant-based and sheds no microplastics. Nylon is hardest to replace in swim and stretch activewear, where the way out is a plant-derived polyamide that builds from bio-based feedstock such as castor oil instead of crude™.
Bio-based is a spec a brand can audit, not a slogan.