Sports Performance Undergarments, ranked by PFAS safety
45 products graded A to F, safest first. None have earned a C or better yet, so we show the full ranking and the least-concerning options first.
Graded and flagged D and F, we’d swap these
Feetures
High Performance Cushion No Show Tab
Acrylic blend sock with no disclosed treatments
Lower concern; no water-repellent coating treatment disclosed for socks.
⚠Risky category by default
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
Puma
Men's 6 Pack 1/2 Terry Socks
Cotton blend terry cloth
Lower concern. Basic socks with no known PFAS-prone treatments.
⚠Risky category by default
Puma
Men's DryCell Crew Socks (8 Pair)
Cotton/polyester blend, DryCell moisture-wicking treatment
Lower concern socks. No known PFAS risk in standard construction.
⚠Risky category by default
Puma
Women's Quarter Crew Socks (6 Pairs)
Cotton/polyester blend socks, no waterproofing
Lower PFAS concern; basic untreated socks without water resistance.
⚠Risky category by default
Puma
Men's Dry Cell Moisture Wicking Socks
polyester and elastane blend, moisture-wicking synthetic fibers
Lower PFAS concern, but brand silent on water-repellent coating treatment used.
⚠Risky category by default
Puma
Men's Half-Terry Crew Socks (3 Pairs)
Cotton/polyester blend, half-terry construction
Lower concern. Basic socks unlikely to contain PFAS.
⚠Risky category by default
Salomon
Everyday Crew 3-Pack Socks
cotton blend (primary), elastane
Lower concern. Basic socks without water-resistant finish.
⚠Risky category by default
Salomon
Pulse Race Flag Crew Socks
Polyester, nylon, elastane blend
Lower concern. Standard athletic socks lack typical PFAS-trigger features.
⚠Risky category by default
Wigwam
625 Wool Sock
merino wool blend
Lower PFAS concern, wool sock without water treatment.
⚠Risky category by default
Wigwam
Ultra Cool Lite Low Socks
Cotton blend, no reported treatment
Lower concern baseline socks, no water-repellent coating treatment evident.
⚠Risky category by default
Wigwam
Men's Cool Lite Pro Low Cut Socks
Acrylic/nylon blend, no known PFAS treatment
Lower concern. Basic athletic socks with no known PFAS treatments.
⚠Risky category by default
Wigwam
Women's Mt. Whitney NXT Socks
Merino wool and nylon blend
Lower concern; wool-based sock without waterproof treatment.
⚠Risky category by default
Wigwam
Ultra Cool Lite Quarter Socks
Cotton, nylon, elastic blend
Lower concern. Uncoated athletic socks without water-resistant finish.
⚠Risky category by default
Puma
Men's Half-Terry Quarter-Length Crew Socks (6 Pairs)
Cotton blend, half-terry construction
Lower PFAS concern; plain socks unlikely to contain PFAS.
⚠Risky category by default
Puma
Men's Low-Cut Socks (6 Pairs)
cotton blend fabric, no water repellent treatment
Lower concern. Standard socks with no water repellent treatment.
⚠Risky category by default
Wigwam
Ultra Cool Lite Quarter Socks 3-Pack
Cotton-blend athletic quarter socks, no described coating
Lower concern. Bare textile socks unlikely to contain PFAS.
⚠Risky category by default
Wigwam
Women's Cool-Lite Low-Cut Crew Cut Socks
Cotton/polyester blend, no water-resistant treatment
Lower concern; basic crew socks without water-resistant finish.
⚠Risky category by default
Wigwam
Ridge Mid-Crew Lightweight Socks
Merino wool blend, standard textile construction
Lower concern. Standard wool sock with no known PFAS treatment.
⚠Risky category by default
New Balance
Pro Run Crew Socks
polyester, nylon, elastane blend
Lower concern for typical crew socks; no waterproofing expected.
⚠Risky category by default
New Balance
Unisex Coolmax Crew Socks 2 Pack
Cotton blend with Coolmax polyester
Lower concern. Basic crew socks with no water-resistant or stain-resistant treatment.
⚠Risky category by default
New Balance
Active Crew Socks 6 Pack
Cotton blend athletic socks, no specified coating
Lower PFAS concern. Cotton-based socks with no water-repellent coating treatment typical.
⚠Risky category by default
New Balance
Men's Cushioned Low Cut Moisture Wicking Socks
Cotton blend with synthetic moisture-wicking fibers, no stated water-resistant treatment
Lower concern; no water-repellent coating treatment typical for low-cut cushioned socks.
⚠Risky category by default
New Balance
Women's Cushioned Ankle Socks
Cotton/synthetic blend, standard construction
Lower concern, standard socks without water treatment.
⚠Risky category by default
New Balance
Unisex Active Crew Socks
Cotton blend athletic socks
Lower concern; basic socks lack typical PFAS triggers.
⚠Risky category by default
New Balance
Cushion Quarter Socks
Cotton blend, cushioned sole (polyester/rubber)
Lower concern. Cotton-based socks rarely treated with PFAS.
⚠Risky category by default
New Balance
Active Quarter Socks 6 Pack
Cotton blend athletic socks, no coating mentioned
Lower concern. Basic athletic socks with no known PFAS treatments.
⚠Risky category by default
Injinji
Trail Midweight Crew
merino wool blend, no water treatment specified
Lower concern; untreated merino wool socks unlikely to contain PFAS.
⚠Risky category by default
Injinji
Run Original Weight Mini Crew
merino wool blend with nylon
Lower PFAS concern; no water-repellent coating treatment typical for this style.
⚠Risky category by default
Injinji
Ultra Run Mini Crew
Merino wool blend, nylon, likely no water repellent treatment
Lower concern. Merino wool socks with no known water-repellent coating finish.
⚠Risky category by default
Injinji
Run Original Weight No Show
merino wool blend with nylon
Lower concern. Merino blend, no known PFAS treatments.
⚠Risky category by default
Injinji
Snow Crew Shadow Toesocks
nylon/polyamide blend with elastane
Lower concern. No water-repellent coating treatment typical for toe socks.
⚠Risky category by default
Injinji
Midweight Mini-Crew Unisex Football Socks
nylon/polyester blend, no reported surface treatment
Lower concern. No waterproof or stain treatments typical of PFAS socks.
⚠Risky category by default
Feetures
High Performance Ultra Light No-Show Tab
Nylon blend with moisture-wicking treatment
Moisture-wicking socks likely treated; brand silent on PFAS
⚠Waterproof or stain-proof treatment
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
Puma
Men's Dry Cell Athletic Crew Socks Moisture Wicking, 8-pack, Size
Polyester blend with moisture-wicking treatment
Standard athletic socks, likely lower concern, but moisture-wicking finish unspecified.
⚠Waterproof or stain-proof treatment
Salomon
Quest Forces Knee Socks with Moisture-Wicking Merino
Merino wool with moisture-wicking treatment
Merino wool is lower concern; water-repellent coating treatment details unknown.
⚠Waterproof or stain-proof treatment
Salomon
Men's Aero Ankle 2-Pack
Merino wool blend with moisture-wicking treatment
Merino socks likely treated for moisture management; PFAS status unclear.
⚠Waterproof or stain-proof treatment
Salomon
Aero Crew Socks
Merino wool blend with water-repellent coating water-repellent finish
Base material lower concern, but water-repellent coating finish source unknown.
⚠Waterproof or stain-proof treatment
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