Wool Sports Performance Undergarments, ranked by PFAS safety
All 8 wool-based options in our sports performance undergarments database, graded Bad to Excellent and ranked safest first. None earn a buy-worthy grade yet, so start from the safest and check the swap suggestions.
Feetures
Elite Light Cushion Tab Limited Edition Performance Socks
Merino wool blend, nylon, elastane
Lower concern. Merino wool socks unlikely to contain PFAS, but brand offers no transparency.
⚠Risky category by default
Feetures
High Performance Max Cushion Tab Socks
Merino wool blend, synthetic fibers
Lower concern socks; no PFAS-prone features identified.
⚠Risky category by default
Smartwool
Men's Run Targeted Cushion Mid Crew Socks
Merino wool blend with synthetic nylon reinforcement
Lower concern. Natural fiber socks unlikely to contain PFAS.
⚠Risky category by default
Smartwool
Run Pattern Crew Socks 3-Pack
Merino wool blend, no water repellent finish
Lower concern. Merino wool socks with no waterproof coating.
⚠Risky category by default
Smartwool
Women's Run Targeted Cushion Low Ankle Socks
Merino wool blend, no specified water-repellent coating treatment
Lower concern. Merino wool socks without disclosed water repellent treatment.
⚠Risky category by default
Smartwool
Unisex Run Zero Cushion Crew Socks
Merino wool blend, no stated water-repellent treatment
Lower concern. Merino wool socks lack typical water-repellent coating coatings.
⚠Risky category by default
Smartwool
Men's Run Zero Cushion No Show Socks
Merino wool blend, no reported water-resistant treatment
Lower concern. Merino wool socks unlikely to contain intentional PFAS.
⚠Risky category by default
Smartwool
Men's Run Cold Weather Targeted Cushion Crew Socks
Merino wool with water-repellent coating finish
Merino wool is PFAS-risk material; water-repellent coating finish raises concern.
⚠Waterproof or stain-proof treatment
See every material: all sports performance undergarments grades →