Do Smartwool sports performance undergarments have PFAS?
Smartwool sports performance undergarments average 58 out of 100 on PFAS Authority's PFAS and toxin screen across the 6 Smartwool sports performance undergarments graded as of October 2026, below the 59 out of 100 median for the 12 other sports performance undergarments brands graded alongside it.
Smartwool sports performance undergarments average Good on our four-band scale. None of them clear our buy threshold. That is above 29% of the sports performance undergarments brands we grade.
PFAS Authority is a scoring system, not a laboratory. We do not test products ourselves. Grades are model-based, built from published ingredients, materials, certifications, brand disclosures and third-party lab results where they exist. See the rubric.
Graded and flagged Poor and Bad, we’d swap these
Smartwool
Run Pattern Crew Socks 3-Pack
- Merino wool blend, no water repellent finish
- We found no PFAS statement from the brand
- Antimony in polyester, The synthetic content (likely nylon/elastane, not polyester) is minimal; nylon does…
2 hazards checked on this product. See all of them.
Smartwool
Men's Run Targeted Cushion Mid Crew Socks
- Merino wool blend with synthetic nylon reinforcement
- We found no PFAS statement from the brand
- Heavy metals, The black and colored variants likely use synthetic dyes; Smartwool has not published azo-dye…
3 hazards checked on this product. See all of them.
Smartwool
Men's Run Zero Cushion No Show Socks
- Merino wool blend, no reported water-resistant treatment
- We found no PFAS statement from the brand
- Antimony in synthetic fibers (nylon/elastane), Antimony oxide is used as a polymerization catalyst in nylon…
3 hazards checked on this product. See all of them.
Smartwool
Unisex Run Zero Cushion Crew Socks
- Merino wool blend, no stated water-repellent treatment
- We found no PFAS statement from the brand
- Antimony in polyester (catalyst residue), Nylon and elastane components do not typically use antimony…
2 hazards checked on this product. See all of them.
Smartwool
Women's Run Targeted Cushion Low Ankle Socks
- Merino wool blend, no specified water-repellent coating treatment
- We found no PFAS statement from the brand
- Azo dyes and synthetic colorants, The specific dyes used in the black or gray colorways are not disclosed by…
3 hazards checked on this product. See all of them.
Smartwool
Men's Run Cold Weather Targeted Cushion Crew Socks
- Merino wool with water-repellent coating finish
- We found no PFAS statement from the brand
- PFAS, Smartwool does not disclose whether this product uses legacy fluorocarbon-based water-repellent coating…
2 hazards checked on this product. See all of them.
Better sports performance undergarments from other brands
Graded higher than the Smartwool average of 58.
Puma
Women's Quarter Crew Socks (6 Pairs)
- Cotton/polyester blend socks, no waterproofing
- Azo dyes
3 hazards checked on this product. See all of them.
Brooks
Brothers Men's 3-Pack Cotton Boxers
- 100% cotton
- We found no PFAS statement from the brand
- Azo dyes and residual dye chemicals
3 hazards checked on this product. See all of them.
Brooks
Brothers Men's Supima Cotton Boxer Briefs
- Supima cotton, no surface treatment disclosed
- We found no PFAS statement from the brand
- Formaldehyde / VOCs
4 hazards checked on this product. See all of them.
The same question, asked of the other sports performance undergarments brands
Best average grade first. Smartwool averages 58.
See every Smartwool product we grade on the Smartwool brand page, or the full sports performance undergarments ranking.