What Is Polyamide? Why Your Label Says It Instead of Nylon

What is polyamide, and why does it keep showing up on clothing labels where you expected to see nylon? On a garment tag, polyamide almost always is nylon: the same synthetic fiber, described by its chemical family name instead of its everyday one.

That small naming difference confuses a lot of shoppers, especially anyone who buys from both European and American brands. Once you know the two words are interchangeable on a care label, the more useful questions are how polyamide behaves, how it compares to polyester and where it earns its place in your wardrobe.

What Is Polyamide, Chemically?

A polyamide is any long chain polymer whose building blocks are linked by amide bonds. That family is broader than clothing. Wool and silk are technically natural polyamides, because proteins are held together by the same type of bond. Aramids, the heat resistant fibers used in protective gear, are polyamides too.

When polyamide appears on a clothing label, though, it means one thing in practice: nylon, the synthetic polyamide developed at DuPont in the 1930s. Nylon stockings went on sale across the US in 1940 and became a sensation, and the fiber has been central to hosiery, swimwear and outdoor gear ever since. DuPont never registered nylon as a trademark, so it became a generic word.

Two types dominate apparel. Nylon 6, written PA6, is made from a single building block with six carbon atoms and was developed in Germany in the late 1930s. Nylon 6,6, written PA6.6 or PA66, is made from two building blocks with six carbon atoms each. For a wearer, the differences are small. Nylon 6,6 has a higher melting point and slightly better abrasion resistance, which is why it turns up in technical outerwear. Nylon 6 dyes easily and tends to be a little cheaper. Both feel and behave like the nylon you know.

Polyamide vs Nylon: Same Fiber, Different Label

The polyamide vs nylon question is about labeling conventions, not material. US labeling rules use nylon as the generic fiber name, and American brands almost always print it. European labeling rules list the fiber as "polyamide or nylon," and European brands overwhelmingly default to polyamide. It helps that polyamide translates almost unchanged across the many languages printed on a single EU care tag: polyamid, poliamida, poliammide.

You can see the split in real product data. In WearScore's index of 2,092 Mango garments, 470 list polyamide and not one says nylon. The 1,254 H&M garments in the index show the same pattern, with 203 listing polyamide and none using nylon. American brands flip it. Of 866 Lululemon garments, 581 say nylon and only 13 say polyamide, and not one of the 509 Gap or 1,464 Everlane garments in the index uses the word polyamide at all.

So if a European sweater says "80% cotton, 20% polyamide" and an American one says "80% cotton, 20% nylon," you're looking at the same blend. For a closer look at the fiber itself, see our guide to what nylon fabric is.

What PA Means on Clothing Labels

Some labels skip the words and use short codes, a habit that's more common on European tags, outdoor gear and technical fabrics. PA is the standard abbreviation for polyamide. You might see "PA 80%, EL 20%" on a swimsuit, or a number attached, like PA6 or PA66, which tells you which nylon type is in the fabric.

A few other codes tend to appear alongside it: PES or PET for polyester, EL or EA for elastane, CO for cotton, WO for wool and CV for viscose. If a tag looks like a string of letters and percentages, those are fiber codes, and PA is nylon. Our guide on how to read clothing labels covers the rest of what a care tag can tell you.

Brand names can hide polyamide too. Tactel and Supplex are nylon, and recycled nylon sold under names like Econyl is still polyamide, just made from reclaimed material such as old fishing nets and carpet.

How Polyamide Fabric Feels and Performs

Polyamide fabric is smooth, strong and springy. It has a soft, slightly silky hand, which is why it works so well in tights and lingerie, and it stretches and recovers better than most fibers even before elastane is added.

Strength is its signature. Nylon has excellent tensile strength and abrasion resistance, so a thin nylon fabric can survive friction that would wear through cotton of the same weight. That's why it reinforces sock heels and toes, makes up backpack and jacket shells, and dominates leggings.

It absorbs a little moisture, a few percent of its weight, compared with almost none for polyester. That makes it feel slightly less clammy than polyester, though it also dries a bit more slowly. Breathability is still limited. A tightly knit nylon top won't move heat and sweat the way cotton, linen or merino does.

The weak points are real. Nylon yellows and weakens with long sun exposure, builds static in dry weather and melts rather than scorching, so high heat from a dryer or iron can glaze or deform it. In tight knits like hosiery it resists pilling well, but in looser blends with cotton or viscose, the strong nylon fibers can anchor pills to the surface so they never break away.

WearScore grades polyamide as Nylon / Polyamide: a synthetic with medium pilling risk and fair breathability. It scores below natural fibers like cotton, linen and wool, but a clear step above polyester and acrylic, and it's treated as perfectly acceptable in activewear and outerwear.

Polyamide vs Polyester

These two synthetics often do the same jobs, so the polyamide vs polyester comparison comes up constantly. Both are plastics, both are strong and both dry quickly, but they differ in ways you can feel.

Nylon wins on feel, stretch and toughness, which is why premium leggings and hosiery favor it. Polyester wins on cost, sun resistance and chlorine resistance, which is why it dominates budget fast fashion and chlorine resistant training swimsuits. Because polyester is cheaper to make, a brand that chooses nylon is usually paying more for a better hand. Our full polyester vs nylon comparison goes deeper into which wins for each type of garment.

Where Polyamide Shines, and Where It Doesn't

Hosiery is polyamide's original home. Sheer tights are typically nylon with a little elastane, because nothing else combines that fineness, stretch and strength.

Swimwear leans on nylon and elastane for a soft, sleek feel and good stretch. Polyester holds up better in chlorine, so frequent pool swimmers sometimes prefer it, while nylon tends to feel nicer for the beach.

Activewear and leggings are where most people meet polyamide today. Nylon and elastane blends give leggings their smooth, compressive feel and stand up to constant movement, which is why Lululemon builds so much of its range on nylon.

Outerwear and bags use nylon for its strength relative to its weight. Ripstop shells, packable puffers and windbreakers all rely on it.

Polyamide is harder to justify in everyday fashion knits and dresses. A sweater labeled "60% viscose, 40% polyamide" can feel soft in the store, but it won't breathe or age like wool or cotton, and the nylon can anchor pills. In a blend like "80% cotton, 20% polyamide," a smaller share of nylon can add durability without costing much comfort. The higher the polyamide share in a non athletic piece, the harder you should compare the price to natural fiber alternatives.

How to Care for Polyamide

Polyamide is easy to care for if you keep heat low. Wash in cold or warm water, ideally inside out to protect the surface, and use a gentle cycle or a mesh bag for tights, lingerie and swimwear. Avoid chlorine bleach, which weakens and yellows nylon.

Tumble dry low or, better, air dry. Nylon dries quickly anyway, and high dryer heat can glaze the surface, set wrinkles and wear out the elastane that's usually blended in. Iron on the lowest setting if you must, keep white nylon out of long direct sun to slow yellowing, and rinse swimwear in fresh water after each use.

Is Polyamide a Good Sign on a Label?

It depends on the garment. Polyamide is the same nylon that has made tights, swimsuits and leggings work for decades. On leggings, a swimsuit or a rain shell, seeing it on the label is usually a good sign, and generally a better one than polyester at the same price.

On a sweater, a dress or an everyday top, it's more of a question mark. It isn't harmful, but it means the garment is partly plastic, won't breathe like natural fibers and may pill in blends. Scan the label with WearScore and you'll see how the full blend grades, including pilling risk and breathability, before you decide whether the price makes sense. Either way, the code is simple once you know it: polyamide is nylon, PA is polyamide, and the fiber is only as good as the job it's been given.