PFAS score
Patagonia · Waterproof Hiking Socks
Patagonia Winter Weight Fleece Oversocks
Lower concern, natural fiber base with no disclosed water treatments.
Patagonia's winter fleece oversocks are primarily merino wool and synthetic fibers without advertised water-repellent coating or stain-resistant coatings, the typical PFAS application points in socks. Patagonia does not publicly disclose PFAS use in this product.
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Material
Merino wool blend, no water-repellent coating treatment specified
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 78% 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.