Fabric decides how activewear feels, moves and lasts. Two pieces can look the same on a hanger, but the material inside makes one comfortable for hours and the other uncomfortable after a single workout. This guide explains what activewear is made of, which fabrics work best, and how to read a fabric label before you buy.
What Is Activewear Fabric?
Activewear fabric is a technical material made to stretch, breathe and handle sweat. It is very different from regular cotton or woven cloth. It is knitted to move in every direction, return to its shape and feel smooth against your skin during movement.
Most activewear fabrics are made from synthetic fibres blended together. Each fibre adds something different, such as softness, stretch, strength or quick drying.
What Material Is Activewear Made Of?
Most activewear uses a mix of the following fibres.
Nylon
Nylon is soft, smooth and strong. It gives fabric a buttery feel and holds its shape well after many washes. It is also light, which makes it comfortable for long training sessions. Many premium leggings and sports bras use nylon as the main fibre.
Polyester
Polyester dries quickly and holds colour well. It is durable and handles sweat easily. It can feel slightly less soft than nylon, but it works well for tops, jackets and loose layers.
Elastane or Spandex
Elastane is the stretch fibre. It is rarely used alone. A small amount blended with nylon or polyester gives fabric its stretch and recovery, so it moves with you and snaps back into shape.
Cotton Blends
Cotton feels soft and natural, but it absorbs sweat and stays wet. It works for light activity and everyday wear, but it is not ideal for intense training.
What Fabric Is Best for Activewear?
The best fabric depends on how you plan to use the piece. For most training needs, a nylon and elastane blend is a strong choice. It gives softness, stretch, support and a smooth feel on the skin.
Here is a simple way to think about it.
- High impact training: Choose a firm, supportive blend with strong stretch recovery
- Gym and weight training: Choose a thicker, squat proof fabric that stays opaque when stretched
- Yoga and low impact: Choose a soft, light fabric with gentle stretch
- Hot weather: Choose breathable, quick drying fabric with ventilation
- Everyday wear: Choose a soft, comfortable blend that holds its shape
What Does the Blend Ratio Mean?
The fabric label shows how much of each fibre is used. A common example is 78% nylon and 22% elastane.
- More nylon gives a softer, smoother and more premium feel
- More elastane gives more stretch, hold and compression
- A balanced mix gives comfort and support together
A ratio around 75 to 80% nylon with 20 to 25% elastane is popular for leggings and sports bras because it gives good hold without feeling stiff. At Confianza, our fabric uses a 78/22 nylon and elastane blend for exactly this reason.
What Does GSM Mean in Activewear?
GSM stands for grams per square metre. It tells you how heavy and thick the fabric is.
- Lower GSM feels light and airy, but can turn see through when stretched
- Higher GSM feels denser and more supportive, and stays opaque during squats
A fabric around 250 GSM sits in a strong middle range. It is thick enough to be squat proof and supportive, while still staying soft and breathable. If you want pieces that stay opaque, GSM is one of the first numbers to check.
Features to Look For in Activewear Fabric
Good fabric does more than stretch. Look for these features.
Four Way Stretch
Four way stretch means the fabric moves lengthwise and crosswise. This lets you squat, lunge and reach without the fabric pulling or pinching.
Moisture Control
Quick drying fabric moves sweat away from the skin so you stay dry and comfortable. This matters most during longer sessions and warm weather.
Breathability
Breathable fabric lets air pass through so heat does not build up. Some pieces use ventilation zones in key areas to keep you cooler.
Opacity
Fabric should stay opaque when stretched. A simple test is to hold it up to light and stretch it. If you can see through it, it will not hold up well during squats.
Sun Protection
Some fabrics offer UPF protection, which is useful for outdoor workouts, runs and tennis.
Strong Construction
Fabric is only part of the story. Flat seams, reinforced waistbands and well placed panels help a piece keep its shape and avoid rubbing.
How Fabric Affects Different Pieces
Different pieces need different things from their fabric.
- Sports bras need firm stretch, strong recovery and breathability for support
- Leggings need opacity, four way stretch and a waistband that stays in place
- Bodysuits need soft stretch that holds its shape without riding up
- Jackets need light, breathable fabric that layers well
- Gym sets need matching fabric that moves and feels the same across both pieces
You can see how this works in our leggings for women and sports bra for women collections, where the fabric is chosen to match what each piece needs to do.
How to Check Fabric Quality Before You Buy
You do not need to be a fabric expert. A few quick checks tell you a lot.
- Stretch test: Pull the fabric gently. It should stretch easily and return to shape
- Light test: Hold it up to light. It should not become see through
- Feel test: It should feel smooth and soft, not rough or scratchy
- Label check: Look for nylon or polyester blended with elastane
- Weight check: Fabric that feels dense and firm usually holds up better
How to Care for Activewear Fabric
Technical fabrics last longer with simple care.
- Wash on a gentle cycle in cool water
- Skip fabric softener, as it reduces stretch and moisture control
- Avoid high heat drying, which damages elastic fibres
- Wash similar colours together
- Air dry when possible
Choose Fabric That Works as Hard as You Do
Now that you know what activewear is made of, choosing the right piece becomes easier. Check the blend, look at the weight and test the stretch before you decide.
If you want fabric built for real training, explore activewear for women from Confianza. Every piece is made with soft, squat proof, four way stretch fabric so you can focus on your workout instead of your clothes.