Most leggings are made from polyester. It's cheap, widely available, and performs well enough at an entry level. Premium leggings — the ones that hold their shape after 100 washes, feel genuinely soft against skin, and work as well in year three as they did in week one — tend to specify polyamide.

Is there a real difference? Yes. Here's what actually changes.

What Are Polyamide and Polyester?

Both are synthetic fibres — petroleum-derived polymers engineered for performance. But they have meaningfully different physical properties at the molecular level, and those differences matter in athletic wear.

Polyester (PET — polyethylene terephthalate) is the dominant synthetic in sportswear. It's stiff relative to polyamide, less smooth against skin, and has a known limitation: it holds onto odour-causing bacteria particularly stubbornly. The fibre structure creates conditions where bacteria embed and survive even standard washing cycles.

Polyamide (nylon) was originally developed as a silk substitute. It's softer, more lustrous, and has a significantly higher abrasion resistance than polyester. The fibre is also inherently more resistant to bacterial adhesion — meaning it holds onto odour less aggressively than polyester, even without added anti-odour treatments.

Softness and Feel Against Skin

This is the most immediately perceptible difference. Polyamide feels closer to natural fibres — smooth, soft, and genuinely comfortable against skin during extended wear. Polyester has a harder hand feel and can create minor friction or irritation in high-contact zones over longer training sessions.

For leggings — which are in constant direct contact with skin during movement — this distinction is meaningful, particularly for high-intensity training, yoga, or long-distance running where any friction compounds over time.

Stretch Recovery

Both fabrics use elastane (spandex) to deliver four-way stretch. But the base fabric affects how well the garment returns to its original shape after stretching.

Polyamide has higher elastic recovery than polyester. In practical terms, this means polyamide leggings are more likely to hold their shape through hundreds of training sessions and washing cycles. Polyester leggings can start to bag — particularly at the knees and seat — more quickly, especially when the elastane content degrades under repeated heat exposure.

For performance leggings, a composition of 78% polyamide and 22% elastane offers a well-tested balance: the polyamide delivers durability and stretch recovery; the elastane provides the unrestricted four-way movement range required for training.

Durability and Resistance to Pilling

Polyamide has significantly higher abrasion resistance than polyester. This matters most in two areas:

• Inner thigh pilling — where legging fabric rubs against itself with each stride. Polyamide resists pilling considerably better than polyester at equivalent construction quality.
• Repeated washing — polyamide maintains its fibre integrity and feel through more wash cycles than polyester, which can gradually develop a rougher texture over time.

If you're buying leggings with the expectation that they'll perform identically in year two as they did when new, polyamide is the better choice.

Odour Management

This is where the difference is most consequential for activewear specifically.

Polyester fibres have a structure that traps sweat and bacteria in ways that survive standard washing. Most people who've trained regularly in polyester leggings will have experienced this: gym clothes that smell fresh out of the machine but return to odour after a single session.

Polyamide is inherently more resistant to bacterial adhesion, which reduces — though doesn't eliminate — odour retention. Added anti-odour treatments also perform better on polyamide base fabrics because there's less baseline bacterial retention to work against.

In APRÍ's APRÍTECH leggings, a 78% polyamide base is combined with HeiQ Mint — a plant-based anti-odour technology derived from peppermint that prevents bacterial activity at the fibre level. This combination retains 94%+ anti-odour effectiveness after 20 washes at 30°C. No silver, no zinc, no PFAS.

UV Protection

Polyamide is naturally better at blocking UV radiation than polyester at equivalent fabric weight. UPF 50+ ratings (blocking 98%+ of UV) are achievable in lightweight polyamide constructions that would require heavier weight to achieve in polyester.

For outdoor training — running, padel, tennis, outdoor yoga — this is a practical benefit that comes built into the fabric rather than requiring a separate coating that could wash off.

Environmental Considerations

Both polyamide and polyester are synthetic, petroleum-derived fibres. Neither is biodegradable, and both shed microplastic fibres during washing.

The environmental case for polyamide is primarily a durability argument: a polyamide legging that lasts five years has a lower lifetime environmental footprint than a polyester equivalent replaced every 18 months. Fewer garments, less total microplastic shedding over time, less production impact overall.

Summary: Polyamide vs Polyester for Leggings

For a practical guide to what to look for when buying, read The Best Workout Leggings for Women in 2026 — covering opacity testing, anti-odour technology, UPF ratings, and certifications in detail.

The APRÍ APRÍTECH Sculpting Mid Waist Leggings use 78% polyamide, 22% elastane with APRÍtech™ HeiQ Mint plant-based anti-odour technology. OEKO-TEX Standard 100, GOTS, and Bluesign certified. Made in Portugal.