Lightweight Running Crew Socks vs 4-Pack Everyday Athletic Crew Socks: which is safer?
Smartwool 4-Pack Everyday Athletic Crew Socks is our pick: better on PFAS and on the overall hazard picture.
Nike
Lightweight Running Crew Socks
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleAzo dyes and heavy metal residues
ReportedMicrofiber shedding
PossibleAntimony in polyester
Our pick
Smartwool
4-Pack Everyday Athletic Crew Socks
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleAzo dyes (aniline-derived synthetic colorants)
PossibleElastane (spandex) degradation and skin contact
PossibleDurable-water-repellent (water-repellent coating) coating composition
Where these two actually differ
- We flag Azo dyes and heavy metal residues, Microfiber shedding and Antimony in polyester on the Nike and not on the Smartwool.
- We flag Azo dyes (aniline-derived synthetic colorants), Elastane (spandex) degradation and skin contact and Durable-water-repellent (DWR) coating composition on the Smartwool and not on the Nike.
- The Nike is Polyester/nylon blend, no reported water-resistant or stain-resistant treatment where the Smartwool is merino wool blend (primary fiber), which is most of the difference in these two grades.
- These two are level, close enough that price and fit should decide it rather than our grade.
Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
More performance socks: see the full ranking