Best Activewear Fabrics Explained: Polyamide vs Polyester vs Cotton
Updated May 2026 — The fabric tag matters more than the brand name. Here's what every gym fabric actually does, feels like, and who it's best for — no marketing fluff.
The Three Main Activewear Fabrics
| Property | Polyamide (Nylon) | Polyester | Cotton |
|---|---|---|---|
| Feel | Buttery, smooth, cool | Slightly textured, crisp | Soft but heavy when wet |
| Stretch | Excellent recovery | Good but slower recovery | Poor, stretches out |
| Moisture | Wicks + dries fast | Wicks + dries fastest | Absorbs 27x weight, stays wet |
| Durability | High abrasion resistance | UV resistant, less pilling | Wears out quickly |
| Odor | Moderate resistance | Holds odor more | Naturally less odor |
| Price | Higher | Lower | Lowest |
| Best for | Gym, yoga, all-day | Running, outdoor | Casual only |
Polyamide (Nylon): The Premium Choice
Polyamide is the gold standard for gym leggings and yoga wear. It's what gives "buttery soft" leggings their signature feel — smooth, cool to the touch, and silky against skin.
- Best for: Leggings, yoga pants, sports bras, anything touching skin
- Why it costs more: More expensive raw material + requires specialized knitting
- The "Align feel": Lululemon's famous Nulu fabric is polyamide-based. So is our AirCloud.
Polyester: The Workhorse
Polyester dries faster than anything else and holds up well outdoors. It's cheaper to produce, which is why budget activewear brands default to it.
- Best for: Running gear, outdoor training, budget-friendly options
- Downside: Can feel "plasticky" compared to polyamide, holds odor more
- When it's fine: If you're running outdoors and need max quick-dry, polyester wins
Cotton: Just Don't
Cotton is comfortable for lounging. For working out, it's the worst choice.
- Absorbs sweat instead of wicking it → becomes heavy and cold
- Stretches out and doesn't recover → saggy knees after one session
- Takes forever to dry → uncomfortable and promotes bacteria growth
- Only exception: Cotton-blend hoodies/sweatshirts for layering (not direct workout wear)
What About Elastane (Spandex)?
Elastane isn't a base fabric — it's the stretch component blended in. Every good activewear piece has 10-25% elastane mixed with polyamide or polyester.
- 10-15% elastane: Light stretch, holds shape well (most leggings)
- 20-25% elastane: Maximum stretch, more compression feel
- Under 10%: Won't stretch enough for squats and yoga
How to Read a Fabric Tag
Next time you pick up a pair of leggings, flip the tag:
- ✅ 80% Polyamide, 20% Elastane — premium gym legging
- ✅ 90% Polyamide, 10% Elastane — buttery soft, yoga-focused
- ⚠️ 88% Polyester, 12% Elastane — fine for running, less soft
- ❌ 95% Cotton, 5% Spandex — casual only, not for real workouts
- ❌ 100% Polyester — no stretch, uncomfortable for gym
FAQ
Is polyamide the same as nylon?
Yes. Polyamide is the technical/chemical name, nylon is the brand name originally trademarked by DuPont. On fabric tags, you'll see both terms used interchangeably.
Why is polyamide more expensive than polyester?
The raw material costs more, and the knitting process for a buttery-soft finish requires more specialized machinery. The difference is typically $3-8 per garment at retail.
Can I mix polyamide and polyester pieces in the same wash?
Yes, they have similar care requirements. Cold water, inside out, no fabric softener, low heat or air dry.
