Nylon spandex and poly spandex are the two workhorses of stretch apparel. They look similar on the roll, and both are usually knit as a tricot or jersey with 10–25% spandex. But they behave differently in production and in wear, and choosing the right one early saves time, money and returns.

The short answer

• Choose nylon spandex when hand feel, stretch and recovery matter most: premium swimwear, dancewear, leotards and shapewear.
• Choose poly spandex when you need color that holds up to sun and chlorine, sublimation printing, or a lower price per yard: team sportswear, printed leggings and activewear.

How they feel

Nylon fibers are smoother and finer, so nylon spandex has a soft, cool, almost silky hand and a slightly higher luster, even in a matte finish. It drapes close to the body and feels luxurious against the skin. Poly spandex is a little drier and crisper to the touch. Modern polyester knits are much softer than they used to be, but side by side most people can feel the difference.

Stretch, recovery and durability

Both fibers rely on spandex for stretch, but nylon is more elastic and more resistant to abrasion. In practice, nylon spandex tends to snap back better after repeated stretching and resists pilling and rubbing, which is why it is the classic choice for swimwear, leotards and garments that see a lot of movement. Poly spandex is still very durable and is often the better pick for garments that are washed constantly, like team uniforms.

Sun, chlorine and colorfastness

This is where polyester wins. Polyester holds dye very well and is more resistant to UV light and chlorine, so colors stay brighter longer. Nylon can fade faster with heavy pool or sun exposure. Note that chlorine eventually breaks down spandex in any blend; for pool-heavy programs such as competitive swim, look at chlorine-resistant constructions and always rinse garments after use.

Printing

• Poly spandex can be printed by sublimation, the most popular method for full-color activewear and team prints. Look for white, print-ready bases (often called PFP, prepared for print).
• Nylon spandex cannot be sublimated. It is printed with acid dyes (wet printing), which gives rich color and a soft hand but is a different production process.

If your collection is print-heavy, this one difference often decides the fiber. See our custom printing options for both.

Price

Poly spandex is generally less expensive per yard than nylon spandex of a similar weight. For high-volume basics or printed programs, that gap adds up quickly across production.

Side-by-side comparison

Which should you choose?

Swimwear

Nylon spandex for a premium feel and fit, such as a matte tricot like Sportivo (82% nylon, 18% spandex, 210 GSM). Poly spandex when the suit will see a lot of sun and pool time or needs a sublimated print.

Activewear and leggings

Both work. Poly spandex interlocks like Interlock Sport and moisture-wicking knits like Dri-Tex are excellent for training gear. Nylon spandex gives leggings a buttery, premium hand.

Dancewear and leotards

Nylon spandex is the traditional choice because of its recovery and luster, including most holograms and foils. Browse our dancewear fabrics.

Test before you decide

The best way to choose is to feel both. Order 1-yard samples of a nylon and a poly option at a similar weight, sew a test garment, and wash it a few times. Our team is happy to recommend a pair to compare for your product.

FAQ

Is nylon spandex better than poly spandex?

Not better, different. Nylon spandex is softer with better recovery; poly spandex is more colorfast, sublimation-printable and usually less expensive.

Which lasts longer in chlorine?

Poly spandex generally holds its color better in chlorine. Spandex itself degrades in chlorine in any blend, so rinse swimwear after every use.

Can you sublimate nylon spandex?

No. Sublimation dyes only bond with polyester. Nylon is printed with acid dyes in a wet printing process.