PFAS score
Thorlo · Waterproof Hiking Socks
Boy Scout Thorlos Low Cut Hiking Socks
Lower PFAS concern, standard sock construction unlikely to require PFAS, but brand makes no explicit commitment.
Thorlo hiking socks are made from conventional acrylic and synthetic fibers with no known water-repellent or stain-resistant treatment applied. The brand does not publicly disclose PFAS use or avoidance. Standard athletic socks of this type are not typical PFAS hotspots, but the lack of transparency leaves some uncertainty.
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Material
Acrylic, nylon, polyester blend (standard athletic sock fibers)
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.