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Activewear is more than just gear; it's a crucial part of your fitness journey, supporting your every move, every stride, and every stretch. So, should you sew your own activewear using the natural touch of cotton or the high-tech edge of polyester?
In this guide, we'll aim to answer your questions about cotton vs polyester for activewear, covering comfort, breathability, moisture management, durability, and care. We’ll also look at alternatives such as nylon, bamboo, and microfiber to help you choose the right fabric for your athletic sewing project.
Before we look at each athletic fabric in more detail, here’s a quick comparison of the points covered in this guide.
| Feature | Cotton | Polyester |
|---|---|---|
| Comfort and breathability | Generally more breathable and comfortable for light movement | Can feel warmer, although mesh and open knits improve airflow |
| Sweat management | Absorbs sweat and may feel heavy once saturated | Absorbs very little water and helps moisture evaporate faster |
| Drying time | Dries slowly and can stay damp for longer | Dries quickly and stays lighter when wet |
| Durability and shape retention | May wear thin, sag, or lose shape over time | More durable and better at keeping its shape |
| Shrinkage, wrinkles, and washing | More likely to shrink, crease, and need careful washing | Resists shrinking and wrinkling and is generally easier to care for |
| Best suited to | Casual wear and low-intensity exercise | Frequent workouts and high-sweat activities |
Cotton is a natural fibre known for its softness, breathability and absorbency. Cotton is soft, like your favourite cozy t-shirt. And it’s smooth, gentle, and hypoallergenic, which is a big thumbs up for anyone with sensitive skin. This makes this activewear fabric perfect for casual wear, walking and other low-intensity activities.
However, scientific studies show that cotton absorbs sweat instead of moving it away from the skin. Once wet, it can feel heavy, clingy and slow to dry, so it may not be ideal for intense workouts or swimming.
Polyester is a synthetic fibre known for its durability, lightweight feel and resistance to wrinkles and shrinkage. It’s often used in activewear because it can withstand regular washing while holding onto its shape wash after wash.
Polyester absorbs very little water, making it quick to dry and easy to care for. However, not all polyester fabric is automatically breathable or moisture-wicking. Its performance depends on how the fabric is knitted, its weight and whether it has been treated to move sweat away from the skin.
Here, we’ll dig deeper into the key differences between cotton and polyester and help you decide which fabric is the best for your DIY activewear.
If you want activewear that feels cool during light movement, cotton is often the more breathable and comfortable choice. It generally allows more air to pass through than standard polyester, helping body heat escape. This can make it comfortable for walking, stretching, or casual workouts in warm weather.
Polyester may feel warmer in a dense knit, but the fabric’s construction makes a big difference. Mesh, fabrics with a perforated design, and open knits can improve airflow, so don’t judge a fabric by its fibre label alone.
Verdict: For comfort and breathability, cotton generally has the edge, but ventilated polyester is a practical choice for more workout-focused activewear.
Cotton absorbs sweat into its fibres, which can feel comfortable during gentle activities such as stretching or restorative yoga. However, once the fabric becomes saturated, it holds onto that moisture and may feel heavy, damp, and slow to dry.
Polyester behaves differently. It absorbs very little water, so sweat moves through the small spaces between the fibres and spreads across the outer surface to evaporate. This makes polyester and polyester-rich fabric a practical choice for running, gym sessions, and other high-sweat workouts.
Verdict: Choose cotton for low-sweat comfort, but pick polyester when moisture-wicking and faster drying matter most. You can also compare the best moisture-wicking fabrics for activewear if you want to explore options beyond cotton and polyester.
Cotton takes longer to dry because it holds moisture inside its fibres. After your sweaty workout, that can leave your clothes feeling damp, heavy, and cool against your skin, especially if you keep wearing them afterward.
Polyester absorbs very little water, so moisture stays closer to the surface and evaporates more quickly. That’s why it stays light on its feet and dries super fast. This makes it a practical choice for frequent workouts, travel, or days when you need your activewear to dry fast.
Verdict: Choose polyester when quick drying matters most. Cotton is still comfortable for low-sweat activities, but it can stay damp much longer once wet.
Cotton is soft and comfy, for sure, but it can also lose its shape faster with regular wear. Repeated stretching, rubbing, and washing may cause areas such as the knees, elbows, and waistband to sag or wear thin, especially in 100% cotton activewear.
Polyester is in it for the long haul as it’s generally more durable and better at bouncing back after movement. It handles frequent washing, friction, and repeated stretching more effectively, which helps workout clothes keep their fit for longer.
Verdict: Choose polyester for activewear that needs to hold its shape and stand up to regular workouts. Cotton is better suited to lighter use, unless it is blended with spandex or another synthetic fibre for added recovery.
In terms of laundry washing, cotton may need a little extra TLC to stay in shape and smooth. Warm water and high dryer heat can cause it to shrink, and it tends to crease more easily, so your activewear may need steaming or ironing to look smooth again. Frequent washing can also gradually affect the colour and fit.
On the other hand, polyester is generally easier to maintain. It resists shrinking and wrinkling, holds its shape well, and usually comes out of the wash ready to wear. It’s still best to use moderate temperatures, especially when the fabric contains spandex, as too much heat can damage the stretch fibres.
But regardless of which fabric you choose, following the right washing and care routine for handmade athletic wear can help your garments keep their fit, stretch, and performance for longer.
Verdict: Choose polyester for low-maintenance activewear that keeps its size and shape. Cotton can still work well, but washing it in cool water and avoiding high heat will help prevent shrinkage.
Cotton and polyester are common choices for sewing sports bras and tanks, but they’re not your only options!
Nylon, for one, is lightweight, durable, and well suited to activewear that needs to handle regular movement, making it a practical choice for leggings and jackets. Spandex is also usually added to other fabrics to improve stretch and help garments move with your body while keeping a close fit.
Bamboo-based fabric can feel cool and comfortable, while merino wool is a useful option for colder workouts because it provides warmth while managing moisture. Microfiber is another lightweight choice that can help keep activewear feeling dry and comfortable during exercise.
Each material brings something different, so the best choice depends on the garment you are sewing and how you plan to use it. Mix and match, test them out, and find your perfect performance blend. Who knows? You might just discover a new favourite that's a perfect fit for your fitness routine.
Once you’ve chosen your fabric, the next step is finding an athletic sewing pattern that suits your experience level and the type of garment you want to make.
Not sure where to start? The Flow Leggings pattern is a practical, beginner-friendly option for sewing your own activewear bottoms. It can be paired with a supportive stretch fabric to create comfortable leggings for workouts, everyday movement, or casual wear.
The Flow Bra pattern is another approachable choice for beginners. It’s ideal for creating a simple activewear top that can be worn on its own or paired with the Flow Leggings for a coordinated handmade set.
For the best results, pair them with a cotton or polyester fabric from our collection of high-performance athletic knits!
Or maybe you’re thinking about sewing swimwear in particular? You can also explore dedicated swimwear sewing patterns from our collection!
When it comes to sewing your own activewear, there’s no single fabric that works best for everyone.
Cotton is a comfortable choice for casual wear and low-intensity exercise, while polyester is usually better for sweaty workouts, quick drying, and long-term durability. Other fabrics such as nylon, spandex, bamboo, merino wool, and microfiber can also be useful depending on the sportswear you’re sewing.
Whether you’re sewing breathable gym tops or sportswear that moves comfortably through every workout, Fabric + Flow has the athletic fabrics and supplies to help bring your project together.
Workout clothes are often made from polyester because it absorbs very little water and dries faster than cotton. It also handles repeated movement and washing well, helping garments maintain their fit through regular workouts.
Yes, 100% polyester can work well for running, gym training, and other sweaty activities, especially when the fabric is designed for moisture management and airflow. For close-fitting garments such as leggings, however, a polyester-spandex blend usually provides better stretch and recovery.
A cotton-polyester blend can offer a comfortable balance between the two fibres. Cotton adds softness and breathability, while polyester improves durability, shape retention, and drying time. It can be a practical option for walking, casual workouts, warm-up clothing, and everyday activewear.
Choose based on the garment and activity. Look for the right mix of stretch, recovery, breathability, opacity, and drying time. Polyester or nylon blends with spandex are often best for fitted, high-movement pieces. Once you have your fabric, make sure you also use the right needles and stitches for activewear.
Comments 1
This was a good article but I was hoping that you added the dangers of synthetic fibers on the skin. Synthetics are highly toxic & this should be noted so customers can make an informed purchase. IMHO