On Running Review, Is On Running Non-Toxic?
On Running averages 43 out of 100 on PFAS Authority's PFAS and toxin screen across the 4 On Running products graded as of October 2026, and none of them reach its 70 point pass mark.
On Running grades Poor on our four-band scale.
PFAS Authority is a scoring system, not a laboratory. We do not test products ourselves. Grades are model-based, built from published ingredients, materials, certifications, brand disclosures and third-party lab results where they exist. See the rubric.
What On Running says and does about PFAS
On says its products are made without intentionally added PFAS, in compliance with New York and California law, and that all its suppliers follow the AFIRM restricted substances list. On is listed as an AFIRM member. That is On’s own claim, and we found no independent PFAS test of On shoes.
- Brand statementOn’s sustainability FAQ says its products are made without intentionally added PFAS, in compliance with New York and California state laws. On (archived page) ↗
- Brand statementThe same FAQ says all its suppliers align with the restricted substance list from the Apparel and Footwear International RSL Management Group (AFIRM). On (archived page) ↗
- Regulatory filingAFIRM lists On among its members. AFIRM Group ↗
Sources checked September 14, 2026. A brand statement is the company’s own claim, which we report but have not verified. Our grades are model-based estimates, not lab tests.
On Running is one of the brands we researched by hand for our record of what every brand has published about PFAS, where the same question is answered for each of them in one line.
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Does On Running have PFAS, by category
Which On Running products contain PFAS? Poor and Bad, we’d swap these
- Knit textile upper, foam midsole, rubber outsole
- Formaldehyde / VOCs. Knit uppers may contain residual formaldehyde-based dyes or wrinkle-resist finishes.…
4 hazards checked on this product, all on its full breakdown.
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- Textile upper, foam midsole, rubber outsole
- Foam midsole degradation and microparticle shedding, EVA and polyurethane foams can break down over time…
- Textile with waterproof coating
- Waterproof coating degradation and leaching. On Running does not disclose the water-repellent coating…
5 hazards checked on this product, all on its full breakdown.
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- textile with waterproof water-repellent coating
- Antimony in polyester components. If the shoe contains polyester fiber (common in modern knit uppers), it may…
2 hazards checked on this product, all on its full breakdown.
Find an alternative on AmazonOn Running and PFAS, common questions
- Does On Running have PFAS?
- On Running averages 43 out of 100 on PFAS Authority's PFAS and toxin screen across the 4 On Running products graded as of October 2026, and none of them reach its 70 point pass mark. Grades are model-based estimates built from published materials, ingredients and disclosures, not lab tests. On says its products are made without intentionally added PFAS, in compliance with New York and California law.
- Is On Running non-toxic?
- No On Running product we graded reaches Good. The best of them is Men's On Cloud 5 at 65/100.
- Which On Running products should I avoid?
- The lowest-graded On Running products we have scored are Women's Waterproof Cloudrunner 2, On Men's Cloud 6 Waterproof, On Men's Running Cloudultra Pro. Each one links to the evidence behind its grade.
Every grade uses the same public rubric. How grades work →