Is Darn Tough PFAS-free?
Across 9 graded products, Darn Tough averages D (65/100). On disclosure, the brand says nothing publicly about PFAS. None of its products grade C or better yet. Grades are model-based estimates, not lab results.
Graded and flagged D and F, we’d swap these
Darn Tough
Men's Run No Show Tab Ultra Lightweight
Merino wool blend
Lower concern; natural fiber socks unlikely to contain PFAS, but brand makes no transparency claim.
⚠Risky category by default
Darn Tough
Men's Run Micro Crew Ultra-Lightweight Running Socks
Merino wool blend, synthetic fibers (nylon/spandex)
Lower PFAS concern for a basic athletic sock; no evidence of water-repellent coating or fluorochemical treatment typical of this category.
⚠Risky category by default
Darn Tough
Men's Spaced Out Micro Crew Lightweight Hiking Socks
Merino wool blend, nylon, spandex
Lower PFAS concern for untreated wool socks, but verify with brand if water-resistance treatment was applied.
⚠Risky category by default
Darn Tough
Men's Hiker Encounter 2-Pack
Merino wool blend, no water-repellent treatment applied
Lower PFAS concern; wool hiking socks without water-repellent coating treatment are a safer choice.
⚠Risky category by default
Darn Tough
Men's Weird and Wild Hiking 2-Pack
merino wool blend, nylon
Lower concern; natural-fiber hiking socks unlikely to require PFAS, but no public disclosure from Darn Tough.
⚠Risky category by default
Darn Tough
Men's Run No Show Tab Cushion 2-Pack
merino wool blend, nylon, spandex
Lower PFAS concern; standard athletic socks without water-repellent coating or stain treatments typical of PFAS use.
⚠Risky category by default
Darn Tough
Men's Limited Edition Run No Show Tab 2-Pack
Merino wool blend (primary fiber)
Lower PFAS concern for core fiber; water-repellent coating treatment status unclear, contact Darn Tough to confirm.
⚠Risky category by default
Darn Tough
Women's Run No Show Tab Cushion 2-Pack
Merino wool blend, synthetic fibers (nylon/polyester), no disclosed water treatment
Lower concern; no water-repellent treatment typical for casual run socks, but verify with brand on water-repellent coating additives if ordered.
⚠Risky category by default
Darn Tough
Men's Ridge Runner Micro Crew Ultra-Lightweight Running Socks
merino wool blend (wool, nylon, spandex)
Lower PFAS concern, basic sock without water-repellent or stain-resistant finishes.
⚠Risky category by default
Every grade uses the same public rubric. How grades work →