Darn Tough Review, Is Darn Tough Non-Toxic?
Darn Tough averages 65 out of 100 on PFAS Authority's PFAS and toxin screen across the 5 Darn Tough products graded as of October 2026, and none of them reach its 70 point pass mark.
Darn Tough grades Good on our four-band scale. On disclosure, the brand says nothing publicly about PFAS. See what every brand has published about PFAS for how that compares.
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.
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Which Darn Tough products contain PFAS? Poor and Bad, we’d swap these
- Merino wool blend, no water-repellent treatment applied
- We found no PFAS statement from the brand
- Antimony in synthetic fibers (nylon reinforcement). Nylon heel and toe reinforcement may contain trace…
2 hazards checked on this product, all on its full breakdown.
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- Merino wool blend, synthetic fibers (nylon/spandex)
- We found no PFAS statement from the brand
- Antimony in synthetic fibers. Nylon and spandex may contain trace antimony as a catalyst residue from…
2 hazards checked on this product, all on its full breakdown.
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- Merino wool blend
- We found no PFAS statement from the brand
- Formaldehyde / VOCs. Synthetic fiber components (nylon, polyester) in blended socks may carry…
2 hazards checked on this product, all on its full breakdown.
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- Merino wool blend, nylon, spandex
- We found no PFAS statement from the brand
- Azo dyes in nylon/spandex. Nylon and spandex components may be dyed with azo dyes, some of which break down…
4 hazards checked on this product, all on its full breakdown.
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- merino wool blend, nylon
- We found no PFAS statement from the brand
- Allergen fragrance or dyes migrating to skin. Merino wool can cause itching in a small percentage of…
2 hazards checked on this product, all on its full breakdown.
Find an alternative on AmazonDarn Tough and PFAS, common questions
- Does Darn Tough have PFAS?
- Darn Tough averages 65 out of 100 on PFAS Authority's PFAS and toxin screen across the 5 Darn Tough 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.
- Is Darn Tough non-toxic?
- No Darn Tough product we graded reaches Good. The best of them is Darn Tough Men's Hiker Encounter 2-Pack at 65/100.
- Which Darn Tough products should I avoid?
- The lowest-graded Darn Tough products we have scored are Darn Tough Men's Weird and Wild Hiking 2-Pack, Darn Tough Men's Spaced Out Micro Crew Lightweight Hiking Socks, Darn Tough Men's Run No Show Tab Ultra Lightweight. Each one links to the evidence behind its grade.
Every grade uses the same public rubric. How grades work →