Polyamide vs Spandex: What These Fabric Labels Actually Mean

Quick answer: polyamide is a durable, smooth synthetic fiber (nylon is a type of polyamide) that gives fabric its structure, strength and slight sheen, while spandex, also labeled elastane, is a stretch fiber added in small percentages to make fabric recover its shape after moving. They almost never appear alone in activewear because they do different jobs — polyamide provides the bulk and durability, spandex provides the stretch and rebound.

What Polyamide Actually Is

Polyamide is a category of synthetic fiber, and nylon is simply the most common type sold under that name — you'll see both terms on activewear tags describing essentially the same material. It's valued for being strong, quick-drying and resistant to abrasion, which is why it forms the majority share of most performance blends. HIVOLT's Women's High Rise Topstitching Leggings use a 78% polyamide, 22% elastane blend at 220 g/m², where the polyamide majority gives the fabric its smooth, structured hand.

What Spandex (Elastane) Actually Does

Spandex, sold as elastane outside the US, is a stretch fiber that can extend several times its resting length and snap back without losing shape. It's almost never the majority fiber — typically 10% to 25% of a blend — because too much spandex makes fabric feel rubbery and lose structure, while too little means the garment sags after a few wears. The Women's Solid High Rise Leggings, built from 75% nylon and 25% spandex at 220 g/m², sit near the upper end of typical spandex content for a legging that still holds its shape through squats.

Why They're Almost Always Blended Together

Neither fiber alone makes good activewear. Pure polyamide fabric would be strong but wouldn't stretch enough for a deep squat or overhead reach. Pure spandex would stretch endlessly but wouldn't hold a garment's shape or resist wear. Blending the two — as seen in the Women's Faux Denim Zip-Fly Leggings at 86% nylon and 14% spandex — gives you structure from the majority fiber and give from the minority one, which is why nearly every legging, sports bra and training jacket on the market blends the two.

How to Read a Blend Percentage

The percentage tells you which property will dominate. A blend like 92% polyester, 8% spandex will feel more structured and less stretchy than an 80% nylon, 20% spandex blend, even though both contain a stretch fiber. Higher spandex percentages, generally above 20%, tend to show up in pieces meant for maximum range of motion like the Women's Full-Zip Sports Jacket at 78% polyamide, 22% elastane, while lower percentages favor structure and durability over stretch.

Polyamide/Nylon vs Polyester: A Quick Note

Polyamide and polyester are both common majority fibers in activewear but aren't the same thing — polyamide (nylon) tends to feel smoother and dries slightly faster, while polyester is generally more UV- and chlorine-resistant and holds color longer. Both work fine paired with spandex; the choice mostly affects hand-feel and how the fabric behaves after repeated washing rather than performance during a single session.

Common Fabric Blends at a Glance

FAQ

Is polyamide the same as nylon?

Yes, nylon is a specific type of polyamide, and the two terms are often used interchangeably on activewear labels. When you see "polyamide" on a tag, it's functionally the same fiber family as nylon.

Should I look for a specific spandex percentage when buying leggings?

Not a fixed number, but generally 15% to 25% spandex gives noticeable stretch and recovery without sacrificing structure. Lower percentages, closer to 8% to 13%, still stretch but feel firmer and hold their shape a bit longer over repeated wears.

Does more spandex mean better quality?

Not necessarily — more spandex means more stretch, but durability and structure come from the majority fiber, whether that's polyamide or polyester. A well-balanced blend matters more than maximizing any single fiber's percentage.

Why do some labels say elastane instead of spandex?

They're the same fiber — spandex is the common US name and elastane is used more often internationally, but both refer to the identical stretch material. You'll sometimes see both terms used within the same product catalog depending on where the description was written.

Bottom Line

When you're comparing activewear, check the blend percentage rather than just the fiber names — a higher stretch-fiber share means more give, and a higher structural-fiber share means more shape retention. Browse fabric details across HIVOLT's bottoms collection and training collection to compare blends directly. Related reading: racerback vs halter sports bras and seamless vs flatlock seam activewear.