PFAS in Running Shoes: Safe Athletic Footwear Guide

You lace up your running shoes a few hundred times a year, and each time your feet are wrapped in materials that could include forever chemicals. Most runners have no idea. I sure didn’t, until I realized the same DWR (durable water repellent) coatings I had learned to avoid in rain jackets were showing up in my everyday trainers. Turns out, shoe manufacturers have been using PFAS in water-repellent and stain-resistant treatments for decades. So I dug into the science, and here is what I found, along with what you can actually do about it.

What’s Inside

• Why running shoes contain PFAS
• The health case for caring
• How to spot PFAS-free running shoes
• PFAS-free running shoes to consider
• Practical tips for runners

Why running shoes contain PFAS

Ever noticed that a brand-new pair of trainers seems to repel rain or resist mud stains right out of the box? That is almost certainly a DWR finish doing the work, and for most of the industry’s history, DWR meant PFAS. A 2022 study in Environmental Science and Technology found that PFAS from DWR-treated textiles can migrate during normal wear and washing, releasing fluorinated compounds into sweat, wash water, and the environment.

The parts of a running shoe most likely to carry PFAS include the upper mesh (especially if it is labeled “waterproof” or “weather-resistant”), the tongue lining, any reflective overlays, and even the insole fabric. Trail runners tend to have heavier DWR treatments than road shoes because they are marketed for wet and muddy conditions, but even a lightweight road shoe can carry a fluorinated finish.

The health case for caring

PFAS do not break down in your body, and they do not break down in the environment. Peer-reviewed research has linked PFAS exposure to thyroid disruption, immune system changes, elevated cholesterol, and developmental concerns in children. Now, nobody is drinking their sneakers. But your feet do sweat, and that warm, damp environment inside a shoe speeds up chemical migration from treated fabrics into your skin. Multiply that by the hundreds of hours a year a regular runner spends in their shoes, and it stops being trivial, especially when it is so easy to avoid.

If you have kids in sports, pay extra attention here. Children absorb chemicals at higher rates relative to body weight, and their cleats, track spikes, and gym shoes come home drenched in sweat after every practice. Switching to PFAS-free footwear is one of the easier ways to lower your family’s overall chemical load.

How to spot PFAS-free running shoes

Finding a PFAS-free running shoe used to feel like detective work, but that has changed fast in the last couple of years. Here is what to look for:

Certifications to trust: OEKO-TEX Standard 100 and bluesign both restrict PFAS in certified products. If a shoe’s listing mentions either certification, that is a strong signal the materials are clean.

Brands with public commitments: KEEN eliminated intentionally added PFAS across its entire footwear line in 2018 and publishes its chemical transparency data openly. Brooks has stated its running shoes are made without PFAS. Allbirds uses a PFAS-free DWR called C-Zero on its waterproof models.

Red-flag language: Be cautious of shoes described as “water-repellent,” “stain-guard,” or “all-weather” unless the brand explicitly confirms a fluorine-free treatment. The presence of GORE-TEX is more nuanced: newer GORE-TEX ePE membranes (expanded polyethylene) are made without intentionally added PFAS, but older GORE-TEX ePTFE membranes are fluoropolymer-based. Check the specific model.

Ask the brand: If the product page does not mention PFAS, a quick email to customer support asking whether the shoe uses fluorinated DWR treatments will usually get a straight answer from reputable brands.

PFAS-free running shoes to consider

I have been testing and tracking PFAS-free shoes for a while now, and these are the ones I keep coming back to. They cover road, trail, and everyday use:

1. Brooks Ghost 17 Men’s Running Shoe - Brooks has stated its running shoes are made without PFAS. The Ghost 17 is the brand’s most popular daily trainer, with DNA LOFT v2 cushioning and a smooth heel-to-toe transition built for road miles.

   

2. adidas Adizero Evo SL Running Shoe - Listed as PFAS-free per brand. The Adizero line is built for speed with Lightstrike Pro cushioning, and adidas has committed to phasing out PFAS across its product lines.

   

3. KEEN Targhee III Waterproof Hiking Shoe (Men’s) - KEEN removed intentionally added PFAS from its entire footwear line in 2018, making every shoe in its catalog a safer pick. The Targhee III uses KEEN.DRY waterproof membrane and works well for trail running and light hiking.

   

Practical tips for runners

You do not need to throw out every pair of shoes you own. That would be wasteful (and expensive). Here is a more practical approach:

Replace as they wear out. Running shoes typically last 300 to 500 miles. When your current pair reaches end of life, choose a PFAS-free replacement rather than buying the same old model on autopilot.

Skip the waterproof treatment sprays. Many aftermarket waterproofing sprays are PFAS-based. If you want weather resistance, buy a shoe that uses a fluorine-free DWR from the factory rather than spraying chemicals onto your existing pair.

Wash running shoes carefully. If your shoes do have a DWR coating, machine washing can accelerate PFAS release into the water supply. Spot-clean with a damp cloth instead when possible, and avoid dryer heat, which can also increase off-gassing.

Check your kids’ athletic shoes too. Youth cleats and cross-country spikes are often treated with the same coatings as adult shoes. Brands like KEEN offer PFAS-free options in youth sizes as well.

If you want to keep going with product swaps around your home, the PFAS Free Life Database is a good place to start. We also have guides to PFAS-free waterproof jackets, PFAS-free hiking pants, and PFAS-free activewear if you are working on cleaning up your athletic wardrobe.

Frequently Asked Questions

Do all running shoes contain PFAS?

No. Many road running shoes, especially those without waterproof membranes or special water-repellent finishes, are not treated with PFAS. Brands like Brooks, KEEN, and Allbirds have made public commitments to remove PFAS from their footwear lines. The risk is highest in shoes marketed as waterproof, water-resistant, or stain-resistant, where PFAS-based DWR coatings have historically been used.

Can PFAS from running shoes absorb through my skin?

While the primary PFAS exposure routes are ingestion and inhalation, your feet create a warm, moist environment inside a shoe that can increase chemical migration from treated fabrics. The total dose from footwear alone is modest compared to sources like contaminated drinking water, but it adds to your cumulative body burden, and it is one of the easier exposures to eliminate by simply choosing a PFAS-free shoe.

How do I know if my current running shoes have PFAS?

Look for keywords like “DWR,” “water-repellent,” or “stain-guard” in the product description. If the shoe is labeled waterproof, check whether the brand specifies a fluorine-free membrane. You can also email the manufacturer’s customer support and ask directly whether fluorinated treatments are used. The PFAS Free Life Database maintains verified product listings that make this research easier.

*Research references: Environmental Science & Technology 2022

eBioMedicine 2021

KEEN Detox Program*