Activewear fabrics explained: nylon, polyester, elastane and blends
Almost every quality difference you feel in activewear comes from the knit and the fibre mix. Once you can read a label, marketing words stop mattering.
Nylon (polyamide)
Soft, smooth, strong and abrasion resistant. Holds shape well and gives that dense, expensive hand feel. Absorbs slightly more moisture than polyester, so it dries a little slower.
Best for: leggings, sets, compression pieces, anything worn close to the skin.
Polyester
Hydrophobic, so it moves sweat outward and dries fast. Lighter and usually cheaper, and it takes prints well.
Best for: running tops, shorts, warm-weather layers.
Elastane (spandex, Lycra)
The stretch fibre. Roughly 8–15% gives everyday flexibility; 18–25% moves into compression territory.
More elastane is not automatically better — high stretch with a thin knit is exactly the combination that goes see-through.
Seamless and ribbed knits
Seamless pieces are knitted as a tube, so there are almost no side seams and less chafing. Ribbed textures add structure and are more forgiving visually, but they stretch more, so sizing matters.
Natural fibres in an active wardrobe
Cotton is comfortable but holds sweat and stays wet — good for the way to the gym, not for the session. Merino regulates temperature and resists odour, which makes it strong for outdoor and cold-weather training.
How to read a label fast
- High nylon + 10–20% elastane = structured, dense, shape-holding.
- High polyester + low elastane = light, fast-drying, breathable.
- Any fabric under about 200 gsm = light layer, check opacity before buying.
- Brushed / fleece backing = warmth, not breathability.
Related reading
How to choose workout leggings: fit, fabric and squat-proof test
Rise, fabric, seams and the one test that tells you everything before you buy.
Activewear sizing and fit: how to get it right online
Three measurements and one rule solve most sizing mistakes.
Beginner running kit: what to actually buy first
Five pieces are enough to start running well. The rest can wait.
Recovery days: what to wear and what actually helps
Rest is training. Here is how to make the easy days count.
Questions on this topic
What should I wear to my first gym session?
High-rise leggings or shorts, a supportive top, a t-shirt you can layer over it and trainers with a stable sole. Comfort and coverage matter more than anything technical at the start.
How many training sets do I actually need?
Two or three. That covers a normal weekly rhythm with laundry in between, and it is enough to see which fit you reach for first.
Leggings or shorts for running?
Below roughly 12°C full-length tights are more comfortable; above that shorts or short tights keep you cooler. The deciding factor is chafing, so choose the option with fewer inner-thigh seams.