Polyester is a synthetic fiber made from polyethylene terephthalate (PET), the same family of plastic used in water bottles. It’s durable, wrinkle-resistant, quick-drying, and colorfast, which is why it’s the most produced fiber in the world: about 59% of global fiber production in 2024, according to Textile Exchange.
How polyester is made
- Petroleum-derived chemicals react to form PET.
- Molten PET is pushed through tiny holes to form filaments.
- The fibers are stretched for strength and either kept long (smooth) or cut short (cotton-like).
- The yarn is knitted or woven, dyed, and finished.
Recycled polyester (rPET) is made from plastic bottles or old polyester textiles.
Pros and cons
|
Pros |
Cons |
|
Durable and abrasion-resistant |
Can feel stuffy in dense weaves |
|
Wrinkle-resistant, holds shape |
Holds odor more than cotton |
|
Dries fast, pushes sweat to the surface |
Static in dry weather |
|
Colorfast |
Sheds microfibers in the wash |
|
Affordable |
Not biodegradable |
Is polyester breathable?
It depends on the weave. Dense polyester (like jacket fabric) is warm. Technical knits used in activewear (mesh, microfiber, moisture-wicking structures) feel cooler than cotton during exercise because they don’t hold sweat.
Is polyester safe to wear?
Yes, for most people. The fiber is inert. Some people with sensitive skin find it less comfortable for long wear. The bigger concern is environmental: synthetic fabrics shed microfibers when washed. Washing cold, using a microfiber-catching wash bag, and running full loads help. Look for OEKO-TEX Standard 100 certification if you want fabrics tested for harmful substances.
Polyester vs cotton
|
|
Polyester |
Cotton |
|
Sweat |
Wicks and dries fast |
Absorbs, stays wet |
|
Durability |
Excellent |
Stretches, wrinkles |
|
Odor |
Holds more |
Holds less |
|
Best for |
Workouts, outerwear |
Loungewear, everyday tees |
Polyester in activewear
Most activewear blends polyester or nylon with spandex for quick-dry stretch. See activewear fabrics compared and polyamide vs polyester.
Care tips
Wash cold or warm (40°C/104°F max), inside out, skip fabric softener on activewear, and air dry. See how to wash and care for activewear.
FAQ
What is 100% polyester?
Fabric made only of polyester fibers. Durable and quick-drying, with less stretch than spandex blends.
Does polyester shrink?
Very little, if you wash cold and avoid high-heat drying.
Polyester vs nylon?
Nylon is softer, stretchier, and more durable; polyester dries faster, holds color better, and costs less.
The bottom line
Polyester is a durable, quick-drying synthetic that’s ideal for workouts. Whether it feels hot depends on the weave, and it’s safe to wear. Choose polyester-spandex blends for training and cotton for lounging.
