New Balance · Sports Performance Undergarments
New Balance Unisex Coolmax Crew Socks 2 Pack
Lower concern. Basic crew socks with no water-resistant or stain-resistant treatment.
Coolmax crew socks are primarily cotton and polyester without water-repellent or stain-resistant finishes. No PFAS-related risk signals detected, but New Balance has not publicly disclosed PFAS policies.
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Material
Cotton blend with Coolmax polyester
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.
The full breakdown
What it's made of and why it matters
These socks are a cotton-polyester blend with Coolmax (polyester microfiber engineered for moisture-wicking). Coolmax itself is inert polyester; the hazard window is during manufacturing and finishing, not use. Cotton and polyester fibers are both widely used in apparel with established safety profiles when not treated with heavy chemical finishes. Crew socks receive minimal processing compared to athletic or compression wear, reducing exposure to dyes, resins, and antimicrobial coatings.
The brand's record and disclosure
New Balance does not prominently publicize chemical testing results or restricted substance lists for basic socks on consumer-facing channels. The company holds bluesign certification for some apparel lines, indicating third-party oversight of dyeing and finishing in those facilities, but certification status for this specific product line is not clearly stated. No major recalls or public health warnings exist for New Balance socks. The brand is not known for aggressive PFAS or flame retardant marketing, which is appropriate for socks that require neither.
How it compares in its category
Standard cotton-blend crew socks from major sportswear brands (Nike, Adidas, Smartwool) occupy similar safety ground. The addition of Coolmax rather than wool or cotton-only construction means slightly higher synthetic processing but avoids lanolin contamination risk and wool-specific flame retardants. Crew socks are among the lowest-treatment textile products; hazard profiles are materially lower than performance leggings, base layers, or treated outdoor wear. Price and material cost suggest standard dyeing rather than premium organic or low-impact processes.
If you buy it
Wash before first wear to reduce loose dye transfer and any residual finishing chemicals. Use warm or cool water; high heat will not harm the blend but may degrade Coolmax moisture properties faster. Replace when elastic degrades or seams separate, typically after 12-18 months of regular use. Store dry in a breathable drawer; prolonged dampness can encourage mildew and bacterial growth, not a manufacturing hazard but a use-phase issue. No special detergents required; standard laundry practices are sufficient.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Azo dyes and colorant residues
Cotton-polyester blends in crew socks typically use reactive or disperse dyes in standard finishing. Excess or poorly fixed dye can release onto skin or transfer to other garments, especially in first washes. New Balance does not disclose dye testing or restrictions for this product line; the hazard exists in category but severity is low for crew socks (minimal skin contact vs. fitted underwear).
Formaldehyde releasers in textile resins
Polyester finishing and some cotton treatments may use formaldehyde-based resins for shape retention and shrink resistance. Crew socks require minimal structure, reducing the likelihood of heavy resin loading, but low levels are common in apparel. Off-gassing occurs mainly during manufacturing and first washes; residual exposure after laundering is negligible.
Antimony in polyester fiber
Polyester filament (including Coolmax) may contain trace antimony as a catalyst leftover from polymerization. Levels in commercial apparel are typically far below acute hazard thresholds and do not migrate during normal wear. Concern is elevated only if fibers are degraded by extreme heat or mechanical damage, which is unlikely in basic crew socks.
Microplastic shedding during laundering
Synthetic fibers including polyester microfibers (Coolmax) shed microplastics during washing, particularly in hot water or with mechanical agitation. This is an environmental and secondary health concern (ingestion via food chain) rather than direct user hazard. No brand-specific mitigation data is available; using a microfiber-capture washing filter reduces shed by 40-90% if user chooses to inves
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.