Adidas · Synthetic Athletic Insoles
Adidas F50 Tunit Chassis Lightweight Insole, 6US / 5.5UK / 38.67EU
Lower concern. Standard foam insole with no known PFAS triggers.
Adidas F50 insole is primarily EVA foam and textiles, materials not typically treated with PFAS. No disclosed waterproofing or stain resistance claims. Adidas has not publicly committed to PFAS elimination.
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Material
EVA foam, textile blend
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
This insole is constructed from EVA (ethylene-vinyl acetate) foam, a closed-cell synthetic polymer widely used in athletic footwear for cushioning and lightweight support. EVA is chemically stable under normal wear conditions and does not leach volatile organic compounds (VOCs) at body temperature. The textile blend upper layer provides breathability and moisture management but introduces a second material stream to evaluate for dyes and finishes.
The brand's record and disclosure
Adidas has made limited public commitments to chemical transparency in foam insoles specifically, though the company publishes general restricted substances lists (RSL) for finished products. No recalls or safety warnings have been issued for this F50 Tunit model. The brand's PFAS disclosure remains opaque, consistent with industry norms for athletic footwear, but PFAS is not a known formulation driver in EVA foam insoles.
How it compares in its category
EVA insoles are standard across mid to premium athletic footwear and carry no known safety disadvantages versus competing foam types (polyurethane, gel). This product sits in the typical safety profile for replacement insoles in its price tier. Textile-lined insoles do require slightly more attention to dye and finish testing than pure foam, but Adidas products routinely meet EU and North American textile safety standards.
If you buy it
Replace insoles every 12-18 months or when cushioning visibly degrades, as worn foam can create pressure points. Machine wash at low temperature if the textile layer requires cleaning; avoid high heat or direct sunlight, which can degrade EVA over time. Store in a dry environment to prevent moisture absorption that may promote odor or mold. Monitor for any skin irritation; if it occurs, rinse and allow skin to air-dry.
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 in textile layer
The textile blend may be dyed with azo colorants, which are restricted but not banned in most markets. Adidas products are tested to restricted substance limits, but no specific test reports for this insole model are publicly available.
VOC off-gassing from EVA foam
EVA foam used in athletic insoles does not typically release significant VOCs at body temperature. No odor or respiratory complaints have been documented for this product line.
Formaldehyde resins in textile finish
Textile components may contain formaldehyde-based finishing resins for wrinkle resistance or stiffening. Adidas formulations should be within safe limits, but specific finish chemistry is not disclosed for this model.
Antimony in polyester content
If polyester is used as a textile layer, it may contain trace antimony oxide as a catalyst, but residual antimony in finished textiles is typically negligible and not a concern during normal wear.
Degradation and microparticle shedding
Over 12-18 months, EVA foam can break down mechanically and shed fine particles into socks and shoes. This is normal wear and not a chemical hazard but may be relevant for users concerned about synthetic particulates.
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 synthetic athletic insoles 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.