Microplastics and “forever chemicals” are becoming impossible to ignore in daily life. From kitchen items and cleaning products to our food, clothing, and personal care items, these contaminants are everywhere. Lately I’ve been paying close attention to what I bring into my home, and non-toxic activewear is an important—yet often overlooked—source of microplastics and persistent chemicals.
Everything You Need To Know About PFAS
To start, here’s a quick explanation of what makes something “toxic” in this context. PFAS (per- and polyfluoroalkyl substances) are a group of man-made chemicals prized for their water-, stain-, and grease-resistant properties. They are used in a wide range of products, including cookware, textiles, cosmetics, and food packaging. PFAS do not readily break down in the environment or the human body, which is why they are commonly called “forever chemicals.” Over time these compounds can accumulate and have been linked to serious health concerns such as certain cancers, immune system suppression, and disruptions to hormonal function.
- Microplastics: Synthetic fibers from activewear shed microplastics during every wash, sending tiny particles into waterways and contributing to broader plastic pollution.
Why Non-Toxic Activewear Matters
PFAS can migrate from fabrics onto the skin, especially when moisture and heat—like sweat—are present. Since many people wear workout clothes for long periods, this prolonged contact raises exposure risks. PFAS exposure has been associated with hormone disruption, impaired immune function, and other health issues that warrant caution.
For my own health priorities—including hormone balance and reproductive health—I choose to avoid activewear treated with PFAS whenever possible. I was surprised to learn how common these chemicals are, even among well-known brands.
Hormone Health
PFAS are known to interfere with the endocrine system. Some of these chemicals can mimic natural hormones like estrogen, potentially leading to imbalances that affect timing of puberty, menstrual cycles, fertility, and risk for hormone-sensitive cancers such as breast or ovarian cancer.
In addition to mimicking hormones, PFAS can bind to hormone receptors and block the action of the body’s own hormones. That interference can disrupt thyroid function and contribute to conditions such as hypothyroidism, altered metabolism, reduced energy regulation, and changes in testosterone levels. For people concerned about hormone health, minimizing exposure to PFAS in clothing and other everyday items is a reasonable precaution.
If you’re looking for brands that emphasize safer, more sustainable materials, consider companies that prioritize organic or responsibly sourced fibers and that disclose their chemical treatments. Examples of brands known for material transparency and reduced chemical inputs include MATE the Label, QUINCE, Organic Basics, Aya, and Happy Earth.