Adidas · Synthetic Athletic Insoles
Adidas +f50 Tunit Light Weight Chassis Insoles.
Insole foam and fabric unlikely to contain PFAS, but Adidas makes no public disclosure.
EVA foam insoles with textile uppers carry lower inherent PFAS risk. Adidas provides no PFAS transparency for this product line.
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Material
EVA foam, synthetic textiles
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
The +f50 Tunit uses EVA (ethylene-vinyl acetate) foam as the primary cushioning material, a thermoplastic elastomer that is chemically inert and stable at room temperature and normal foot temperatures. Synthetic textiles cover the foam surface; these are typically polyester or nylon blends. EVA does not leach toxic compounds under normal wear conditions, and the textile covering prevents direct skin contact with any potential foam degradation products.
The brand's record and disclosure
Adidas has not published detailed material safety data sheets or restricted substance lists specific to insole products. The company maintains a general sustainability commitment but does not voluntarily disclose PFAS, formaldehyde, or heavy metal testing results for footwear components. No recalls or safety violations tied to Adidas insoles are on record. The silence on disclosure is a transparency gap rather than evidence of harm.
How it compares in its category
EVA foam insoles are industry standard and among the safer cushioning options; many competitors (Nike, Asics, New Balance) use identical or similar materials without documented hazards. Insoles are a lower-risk category than full shoes because they contact skin only briefly and are not heated or microwaved. Replacement frequency (every 6-12 months) limits long-term exposure.
If you buy it
Store in a cool, dry place away from direct heat and sunlight, which can accelerate EVA degradation over years. Do not machine wash; rinse gently with cool water and air dry. Replace when compression reduces cushioning visibly or odor develops, typically after 6-12 months of regular use. Monitor for any skin irritation (rare); discontinue use if rash or allergic response occurs.
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.”
Formaldehyde resins in synthetic textiles
Polyester and nylon blends used in insole uppers may contain formaldehyde-based resins for wrinkle resistance or dye fixation. Concentration is typically minimal in finished insoles, and skin contact is brief. No specific testing or complaints documented for this product.
Azo dyes in textile covering
Synthetic textile dyes may include azo compounds, which can release carcinogenic amines under certain conditions. Insoles typically use darker dyes (black, grey) and are not subject to sweat or heat exposure sufficient to trigger breakdown. Risk is low relative to apparel worn directly against skin.
EVA thermal degradation
EVA foam can degrade and off-gas volatile organic compounds (VOCs) if exposed to sustained heat above 60-70°C. Normal foot temperature (around 35-37°C) does not trigger this. Risk emerges only if insoles are stored near heat sources or in hot vehicles for extended periods.
Microplastics from foam degradation
EVA foam fragments can shed microscopic particles with age and wear. Quantity is small and limited to the insole interior; particles do not enter the bloodstream from skin contact and are not ingested. This is a minor environmental concern rather than a direct health hazard.
Heavy metals in synthetic pigments
Adidas does not disclose pigment composition, but modern synthetic textile dyes rarely contain cadmium or lead in regulated markets. No testing or recalls indicate contamination in Adidas insoles. Risk is theoretical only.
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.