Injinji · Sports Performance Undergarments
Injinji Snow Crew Shadow Toesocks
Lower concern. No water-repellent coating treatment typical for toe socks.
Injinji toe socks are primarily nylon and elastane with no reported water-repellent coating. Brand does not disclose PFAS use, but the material composition suggests minimal PFAS risk typical of basic hosiery.
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Material
nylon/polyamide blend with elastane
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
Injinji Snow Crew Shadow uses a nylon/polyamide blend with elastane (spandex) for stretch and fit. Nylon is a synthetic polymer with a well-established safety profile in apparel; elastane at typical sock concentrations (5-20%) poses no identified chemical risk in normal wear. Neither component is known to leach problematic substances during normal use or machine washing at standard temperatures.
The brand's record and disclosure
Injinji does not publicly disclose chemical testing, third-party certifications (Oeko-Tex, GOTS), or detailed supply-chain transparency on their website. No recalls or safety controversies for this product line are on record. The brand's silence on PFAS treatment is consistent with most athletic sock manufacturers and reflects low likelihood of water-repellent coating on performance toe socks, which rely on moisture-wicking rather than water resistance.
How it compares in its category
Injinji toe socks are mid-range athletic products without marketed water-resistance claims, placing them lower-risk than outdoor performance socks (which often carry water-repellent coating coatings). Peer alternatives like Darn Tough and SmartWool similarly lack public chemical disclosure but have stronger certification credentials. Injinji's silence on testing is a transparency gap, not necessarily a safety indicator, for this material class.
If you buy it
Machine wash in cool water (avoid hot, which is not typical for socks anyway) and air dry to preserve elastane integrity over time. Replace socks after 12-18 months of regular use as elastane degrades and loses stretch; degradation does not release hazardous byproducts but reduces support. No special care needed beyond standard laundry; do not bleach to minimize any residual dye oxidation risk.
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
No reports of unsafe azo dyes in Injinji socks. The 'Shadow' colorway (dark gray/black) uses standard textile dyes; nylon takes dye readily without known carcinogenic azo compounds in mainstream US-marketed brands.
Formaldehyde resins in finishes
Nylon toe socks do not typically receive formaldehyde-based wrinkle-resistant or antimicrobial finishes common in cotton blends. No evidence of such treatment in this product.
Elastane (spandex) degradation and leaching
Elastane loses integrity over 1-2 years with regular washing but does not leach monomers (MDI precursors) into sweat at skin-contact temperatures. Risk is functional (loss of stretch) rather than chemical.
Heavy metals in dyes
No recalls or reports of excess lead, cadmium, or chromium in Injinji products. Standard nylon dyeing in compliant US/EU supply chains avoids these metals, though Injinji does not publish heavy-metal testing data.
Microplastic shedding
Synthetic nylon/elastane socks shed microfibers during washing like all synthetic textiles. Shed is minimal (grams per wash-cycle) but contributes to aquatic microplastic load; does not pose direct health risk to wearer.
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.