PFAS score
Smartwool · Sports Performance Undergarments
Smartwool Unisex Run Zero Cushion Crew Socks
Lower concern. Merino wool socks lack typical water-repellent coating coatings.
Smartwool Run Zero socks are primarily merino wool with no disclosed water-repellent finish. No PFAS claim, but bare wool presents lower risk than treated performance apparel.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Merino wool blend, no stated water-repellent treatment
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
Category baseline
clothing is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
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 sports performance undergarments 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.