PFAS score
Thorlo · Waterproof Hiking Socks
Thorlos Walking Crew 3-Pair Pack
Lower concern; traditional sock materials with no known PFAS triggers, but brand silence limits assurance.
Thorlos Walking Crew socks are primarily merino wool, acrylic, and nylon, materials not typically treated with PFAS water-repellent coating (water-repellent coating) coatings. Thorlo does not publicly disclose PFAS use or avoidance. No third-party PFAS certification or lab testing appears publicly available for this product line.
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Material
Merino wool blend, acrylic, nylon
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
clothing is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
More waterproof hiking socks grades
How we score: every product runs through the same public 0–100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.