TL;DR: Wayve doesn't use polyester because it's plastic — and research shows polyester can release microplastics, disrupt hormones, and affect fertility through skin contact. We use organic cotton, merino wool, and other natural fibers that perform better and support your health.
Why doesn't Wayve use polyester?
Because polyester doesn't belong on your skin. Wayve exists to prove that natural materials perform better, feel better, and support your health — without toxins or synthetics.
What's wrong with polyester in activewear?
Most activewear today is made of polyester and elastane. They're cheap, stretchy, and convenient for companies — but problematic for your body.
When you sweat, polyester fibers can release microplastics and chemical residues. Over time, these may interfere with hormone systems (the endocrine system). Some research suggests potential impacts on fertility, especially with prolonged skin contact.
What does the research say about polyester and health?
Here are a few key studies and findings:
- Dogs wearing polyester garments — An older study found that dogs wearing polyester pants showed negative effects on sperm production, whereas control groups wearing cotton did not. (PubMed: Effect of different types of textile fabric on spermatogenesis)
- Polyester and fertility in female dogs — A follow-up study found that female dogs wearing polyester fabric had diminished progesterone levels, failed conception, and ovarian issues — which reversed when the polyester was removed. (PubMed: Polyester textiles and canine reproduction)
- Human polyester sling trials — In early human testing, polyester slings worn for 12 months induced temporary infertility that reversed after removal. (PubMed: Contraceptive efficacy of polyester sling)
- Microplastics and hormone disruption — A 2023 review found that micro- and nano-plastics can act as endocrine disruptors, altering hormone signaling. (PMC: Microplastics and Endocrine Disruption)
- Chemical migration from polyester to skin — Research has shown that antimony and bisphenols can leach from polyester textiles into sweat-like conditions, raising health concerns. (MDPI: Release of Antimony from Polyester Textiles) and (PMC: Bisphenols in Clothing and Dermal Exposure)
These studies don't claim polyester always causes harm in every wearer — but they do show plausible risks worth avoiding.
What does Wayve use instead of polyester?
We use organic cotton, merino wool, and other natural fibers — materials that breathe, regulate temperature, and work with your skin, not against it.
How do natural fibers perform better?
- Breathable: Airflow helps regulate body temperature naturally.
- Comfortable: Organic cotton softens with every wash.
- Odor-resistant: Merino wool handles moisture naturally — no synthetic finishes.
- Durable: Natural fibers age gracefully without breaking into microplastics.
Check out the Quad Short (organic cotton + merino wool), the Classic Short (organic cotton), the Only Tee (organic cotton), and the Flow Set (100% merino wool for women).
Frequently Asked Questions
Is polyester bad for your skin?
It can be. Synthetic fabrics like polyester can trap heat, hold volatile chemical residues, and shed microscopic fibers that your skin contacts directly.
Are natural fibers durable enough for workouts?
Yes — high-quality cotton and merino wool can handle training, movement, and daily wear.
Is polyester exposure proven to cause infertility in humans?
The human evidence is limited but concerning. Early studies found reversible effects in some men; animal data show stronger outcomes.
Why does polyester have chemical risks?
Polyester fabrics often include additives, dyes, and catalysts such as antimony — and studies show these can migrate toward the skin.
Learn more about Wayve's natural material philosophy on Our Story.