Asics · Synthetic Athletic Insoles & Orthotics
Asics Ortholite Liner Inserts Women/Men's Replacement Insoles
Lower concern. Standard foam insole with no known PFAS triggers identified.
Ortholite insoles use standard polyurethane/EVA foam without water-repellent or stain-resistant coatings. Asics makes no PFAS disclosures, but the material composition suggests lower risk compared to treated textiles or coated footwear.
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Material
Ortholite foam cushioning, polyurethane or EVA foam base
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
Ortholite is a proprietary polyurethane foam cushioning material, often blended with EVA (ethylene-vinyl acetate) foam as a base layer. Polyurethane foams can theoretically release volatile organic compounds (VOCs) during manufacture and initial cure, but finished insole products like this are typically well-cured and pose minimal VOC risk in normal wear. The closed-cell structure of cured foam limits leaching of uncrosslinked oligomers into sweat or skin contact, making migration of hazardous compounds unlikely under typical use conditions.
The brand's record and disclosure
Asics does not publicly disclose detailed chemical composition or third-party safety certifications specific to insole liners. The brand has a moderate track record on transparency, with some sustainability reporting but limited toxicant disclosure for component materials. No recalls or safety alerts have been associated with Ortholite insole products. Asics maintains general compliance with OEKO-TEX and other footwear safety standards, though specific insole certifications are not widely advertised.
How it compares in its category
Replacement insoles like these sit in a low-risk category compared to primary shoe uppers or adhesives. Ortholite-branded foam is considered a mid-market cushioning choice, comparable in safety profile to other name-brand polyurethane insoles (Spenco, Superfeet). Most concerns in footwear relate to dyes, adhesives, and textile coatings rather than the foam cushioning itself, making the insole liner a safer component choice than the shoe as a whole.
If you buy it
Store insoles in a cool, dry place away from direct heat or prolonged UV exposure, which can accelerate foam degradation. Wash hands after handling if you have sensitive skin, though dermal contact risk is minimal. Replace insoles when compression becomes visible or cushioning noticeably decreases, typically every 12-18 months depending on activity level. Do not expose to solvents or cleaning chemicals that may degrade the polyurethane bond.
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.”
Volatile organic compound (VOC) off-gassing from polyurethane foam
Cured polyurethane insole products pose negligible VOC risk after manufacturing. Off-gassing occurs primarily during production and early cure; finished insoles sold at retail are stable. No reports of odor complaints or health effects specific to Ortholite insoles in use.
Formaldehyde in textile backing or adhesives
Ortholite foam itself does not typically contain formaldehyde. If insoles include fabric facing or adhesive layers, minimal formaldehyde exposure is expected given the closed construction and brief contact with skin. No known formaldehyde detections in Asics insole products.
Azo dyes in fabric facings or colorants
If insoles include dyed textile tops or colored foam layers, restricted azo dyes could theoretically be present. However, direct skin contact is indirect (worn inside shoe), and migration through sweat is minimal. No incidents or test failures reported for this product line.
Microplastic shedding from foam degradation
Foam insoles can shed fine particles over time as material breaks down from compression and moisture exposure. Particles remain largely contained within the shoe, but small amounts may be released into the environment at end of life. This is a material-class issue, not specific to Asics, and poses negligible direct health risk during normal wear.
Latex or natural rubber allergen contamination
Ortholite is synthetic polyurethane and EVA, not latex-based. No known latex allergen risk. Individuals with polyurethane sensitivity are rare, but those with isocyanate exposure history or polyurethane respiratory sensitivity should avoid prolonged contact with new foam in confined spaces.
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 & 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.