What’s in Your Workout Clothes? A Look at Microplastics

What Are Microplastics?

Microplastics are tiny plastic particles — often less than 5 millimeters long — that come from the breakdown of larger plastic products. They’re now found in our oceans, air, food, water, and yes — even our clothes.

Most athletic wear is made from synthetic fibers like polyester, nylon, and spandex. Every time you wash these materials, microplastics shed into the water system. Over time, they enter the environment — and our bodies.

Why It Matters for Your Health

Microplastics have been detected in human blood, lungs, and even placenta tissue. While research is ongoing, early evidence suggests they may contribute to:

• Hormonal disruption
• Inflammation and oxidative stress
• Gut microbiome changes
• Long-term toxic exposure

For people who wear synthetic activewear daily — and sweat in it — exposure may be higher, especially when worn tight to the skin for extended periods.

Which Materials Shed the Most?

Synthetic fibers like polyester and acrylic are among the worst offenders. Blended fabrics may shed less than 100% polyester, but they still contribute to microplastic pollution. Natural fibers like cotton, bamboo, and wool do not create microplastics — though they come with their own environmental trade-offs.

Are There Healthier Alternatives?

Yes, but they come with caveats. Look for:

• Organic cotton activewear
• Merino wool blends for breathable performance
• Brands using recycled ocean plastics (though these still shed)

Some companies are experimenting with biodegradable or plant-based performance fabrics, but options are still limited — especially for high-sweat, high-mobility use.

How to Reduce Exposure (and Pollution)

• Wash synthetic clothes less often: Only when needed — and on cold, gentle cycles
• Use a microfiber filter or laundry bag: Like the Guppyfriend bag or a washing machine filter
• Avoid dryers: Line-dry when possible — heat increases fiber shedding
• Buy higher-quality gear: Cheap fast fashion sheds more due to weak fibers

Does Sweating Make It Worse?

Potentially. Sweat and friction can increase absorption of chemicals through the skin — and tight-fitting synthetic gear often traps sweat, bacteria, and heat. While the long-term effects aren’t fully known, it’s wise to shower promptly after workouts and rotate clothing materials.

Should You Ditch All Your Leggings?

No need to panic — but awareness matters. If you wear synthetic activewear regularly, balance it with smarter washing practices and occasional natural-fiber options.

And when it’s time to replace gear, shop intentionally — not impulsively.

Final Thoughts

Your workout clothes should support your health — not undermine it. While we wait for better fabric innovation, small choices add up: what you buy, how you wash, and how long you keep each piece.

Think of it as part of your whole-body wellness strategy. Because detoxing your lifestyle starts with what’s closest to your skin.