Best Fabric for Workout Clothes: Polyester vs Nylon vs Cotton

The fabric your workout clothes are made from decides how they feel at minute 45, not just minute one. It affects how much you sweat through, whether you chafe, how freely you move and how long the garment lasts. This guide compares the three fabrics you'll see most often, polyester, nylon and cotton, and explains the role of spandex, so you can pick the best fabric for your workouts.

What Makes a Good Workout Fabric

Moisture management

You will sweat. The question is what your clothes do with it. A good workout fabric pulls sweat away from your skin and lets it evaporate quickly, so you stay drier and lighter. A poor one soaks it up and holds it.

Stretch and recovery

Squats, lunges, sprints and yoga poses all ask a lot of your clothes. Good activewear stretches as you move and then springs back to shape, without sagging at the knees or riding up.

Breathability and weight

Lighter, more open fabrics let air and heat escape. Heavier fabrics feel warmer and take longer to dry. For most training, lighter is better; for cold-weather sessions, a little more weight adds warmth.

Polyester: The Quick-Dry Workhorse

Polyester is the most common activewear fibre for good reason. It absorbs very little water, so it dries fast and stays light when you sweat. It's durable, holds its shape and colour well, and is easy to care for.

The trade-off: polyester can hold on to odour more than natural fibres, which is why many performance pieces add an antibacterial treatment. It can also feel slightly less soft than nylon.

Best for: gym training, running, HIIT and hot, humid days. Many VYO tees, shorts and trousers use polyester-spandex blends, such as 90% polyester and 10% spandex.

Nylon (Polyamide): Smooth, Soft and Strong

Nylon, also called polyamide, has a smooth, almost silky feel against the skin. It's very strong for its weight, resists abrasion and offers excellent stretch when blended with spandex. It dries quickly, though usually not quite as fast as polyester.

Best for: fitted pieces where comfort and feel matter, like long sleeve tops, women's stretch pants, shorts and lightweight jackets. VYO's women's High Stretch Performance Pants, for example, use 74% polyamide and 26% spandex. 

Cotton: Comfortable, But Not for Hard Sessions

Cotton is soft, breathable when dry and comfortable for everyday wear. The problem starts when you sweat: cotton absorbs moisture and holds it, getting heavier, clingier and slower to dry. Wet cotton is also more likely to cause chafing.

Best for: warm-ups, light stretching and lounging. For anything sweaty, a synthetic performance fabric will serve you better.

Why Spandex Matters in Activewear

Spandex (also called elastane or Lycra) is the stretch in your activewear. Even a small amount transforms how a garment moves. As a rough guide:

• 5–10% spandex: comfortable stretch for tees, shorts and trousers.
• 12–15% spandex: noticeably stretchier, good for performance tops and fitted pieces.
• 20%+ spandex: high stretch and a close, supportive fit, typical of yoga pants and fitted long sleeves. 

Spandex doesn't do much on its own; it's blended with polyester or nylon to add stretch and recovery to their other strengths.

Fabric Comparison Table:

	Polyester	Nylon(polyomide)	Cotton
Moisture Handling	Wicks and dries very fast	Wicks and dries fast	Absorbs and holds sweat
Feel	Light, smooth	Very smooth, soft, silky	Soft, natural
Stretch (with spandex)	Good	Excellent	Limited
Durability	High	Very high	Moderate
Odour	Can hold odour without treatment	Can hold odour, without treatment	Lower odour retention
Best for	Gym, running, heat	Fitted pieces, yoga, comfort	Rest days, warm-ups

 

Matching Fabric to Your Workout

Gym and HIIT

Choose polyester-spandex blends for fast drying and freedom of movement. Look for 4-way stretch in shorts and pants so squats and lunges feel unrestricted. Explore gym and training wear.

Running

Go light and quick-dry: a polyester or nylon tee or singlet, plus lightweight stretch shorts with a smooth, low-friction surface. See our guide to what to wear running in hot weather.

Yoga and Pilates

Prioritise stretch and softness. Nylon-rich fabrics with higher spandex content give a close, comfortable fit that moves with every pose. Try women's stretch pants or women's t-shirts.