Injinji · Sports Performance Undergarments
Injinji Midweight Mini-Crew Unisex Football Socks
Lower concern. No waterproof or stain treatments typical of PFAS socks.
Injinji midweight socks use nylon/polyester without documented water-repellent coating or stain treatments. Brand makes no PFAS claims; no lab testing found in public records.
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Material
nylon/polyester blend, no reported surface treatment
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 nylon and polyester blend without reported surface treatments like waterproofing or stain resistance. Polyester is a petroleum-derived synthetic fiber; nylon is similar but slightly more prone to static buildup and thermal instability. Neither material is known to off-gas formaldehyde or volatile organic compounds at normal body temperatures, though polyester manufacturing may use antimony as a catalyst (residual amounts are typically negligible in finished fabric). The blend itself is durable and unlikely to shed microplastics under normal washing and wearing conditions at body temperature.
The brand's record and disclosure
Injinji has not published public certifications (such as OEKO-TEX or Bluesign) or detailed disclosure on chemical treatments for this line. The brand is silent on PFAS policy, which is notable given the rise of performance sock lines using fluorochemical water repellents. However, their midweight football sock line does not claim water-resistant or stain-guard features, which are the typical vectors for intentional PFAS addition in apparel. No recalls or public safety complaints tied to this specific product are on record.
How it compares in its category
Standard performance socks in this price and feature range (nylon/polyester blends) are common and carry similar low chemical risk. Socks marketed as waterproof or moisture-wicking with advanced treatments are more likely to contain PFAS or other fluorochemicals. Injinji's lack of third-party certification is slightly weaker than competing brands that pursue OEKO-TEX Standard 100, but the absence of waterproof claims keeps chemical exposure risk lower than premium performance alternatives.
If you buy it
Wash in warm water (not hot) to minimize any potential heat-driven leaching of residual dyes or finishes. Dry at low heat or air-dry to avoid degrading the nylon/polyester fibers. Replace socks when elasticity is lost or seams show wear, as degraded synthetic fibers may shed more readily. No special precautions are needed during normal use; 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
No data on azo dye use in this product line is publicly available. Standard polyester/nylon socks may use azo dyes in manufacturing, but they are typically bound to the fiber and do not migrate under normal wear or washing at body temperature.
Antimony in polyester
Polyester is often manufactured with antimony trioxide as a catalyst. Residual antimony in finished fabric is usually far below regulatory thresholds, but no product-specific testing data for this sock is on record. Risk is considered negligible under normal use conditions.
Formaldehyde resins (finishes and dyes)
No waterproofing or permanent-press treatment is claimed for this midweight sock, reducing the likelihood of formaldehyde-releasing resins. Standard dyeing and finishing processes may involve trace formaldehyde, but volatilization at body temperature is minimal.
Microplastic shedding
All synthetic fiber textiles shed microplastics to some degree during washing and wear. Nylon/polyester blends are not exceptional shedders, but cumulative exposure from repeated laundering is a known concern for any synthetic sock. Washing in cold water and using a lint trap can reduce release.
Allergen residues (dyes, finishes)
No specific allergen warnings or contact dermatitis reports are on record for this product. Individuals with sensitive skin or dye sensitivities should test on a small area first, as with any new textile.
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.