Adidas · Athletic Insoles & Orthotics
Adidas F50 Tunit Chassis Comfort Insole, 5.5US / 5UK / 38EU
Lower concern insole, but Adidas offers no PFAS transparency.
EVA foam insoles typically contain no PFAS, but Adidas provides no public disclosure on PFAS use or testing. Consider other brands with certified PFAS-free claims for higher assurance.
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Material
EVA foam/rubber insole with mesh lining
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 with a mesh fabric lining. EVA is a closed-cell polymer commonly used in footwear cushioning and is generally considered inert once cured. The mesh lining is typically polyester or nylon, which can shed microfibers under friction but poses minimal risk in insole use since it does not contact food or prolonged skin contact in the way apparel does. No volatile organic compounds (VOCs) are commonly reported from EVA insole manufacturing at the consumer use stage.
The brand's record and disclosure
Adidas has not published specific PFAS testing data or reduction commitments for insole products, despite pressure on footwear brands regarding PFAS in water-resistant coatings and performance treatments. The company has issued general sustainability statements but remains silent on chemical transparency for comfort insoles specifically. No major recalls or regulatory actions specific to F50 Tunit insoles have been documented. Adidas maintains ISO 14001 certifications at facilities but does not disclose supplier-level chemical screening for this product category.
How it compares in its category
Insoles made from EVA are the industry standard and carry lower chemical risk than gel or memory-foam alternatives, which can leach plasticizers in warm conditions. Unlike textile shoe uppers, insoles do not face formaldehyde-resin finishing or azo-dye exposure because they are not colored or treated with wrinkle-resistant chemicals. This product sits in the safer middle tier of insole options; premium brands (e.g., Superfeet, Powerstep) offer comparable or better transparency, while budget alternatives rarely disclose materials at all.
If you buy it
Store insoles in a cool, dry place away from direct heat or sunlight to prevent any accelerated foam degradation. EVA foam breaks down over 1-2 years of regular use; replace when cushioning noticeably flattens or you detect odor, which may signal microbial growth rather than chemical off-gassing. Do not expose to temperatures above 140°F (60°C), which can degrade the foam structure. Hand wash mesh lining occasionally with mild soap if it collects odor; machine washing is not recommended.
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 or formaldehyde releasers (textile treatments)
EVA insoles do not require formaldehyde-based resin finishes used in fabric dyeing or wrinkle-resistance. The mesh lining may carry trace residues from generic polyester production, but no established reports link F50 insoles to formaldehyde off-gassing.
Azo dyes or heavy metals in pigments
Insoles are typically not dyed; they remain the natural off-white or tan color of EVA. Colored mesh linings, if present, are minimally dyed and do not contact skin long enough to warrant azo-dye or heavy metal concern.
Phthalates or plasticizer leaching
EVA foam itself contains minimal phthalates, but the adhesive used to bond mesh lining to foam may contain trace plasticizers. Risk of leaching to skin is low given the enclosed structure and lack of heat or moisture exposure during typical wear. No recalls or complaints specific to this product have been documented.
Microfiber or microplastic shedding
Mesh linings shed microfibers through friction, but insoles are not heated or worn in contact with food preparation surfaces. Shed fibers are minimal and dispersed into footwear rather than ingested or inhaled.
Antimony in polyester lining
Some polyester textiles contain antimony trioxide as a catalyst; insole linings are low-mass and low-contact, so systemic exposure is negligible. No data suggest elevated antimony in Adidas insole products.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 68% 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 athletic insoles & orthotics 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.