Asics · Synthetic Athletic Insoles & Orthotics
Asics Gel Resolution Replacement Insoles Men’s Size 10.5 Tennis Shoe
Lower concern. Standard insole materials rarely treated with PFAS.
Asics does not disclose PFAS in replacement insoles. Gel foam and synthetic rubber insoles typically lack PFAS treatment unless waterproofed or stain-treated, which is uncommon in insoles. No public lab data available.
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Material
Gel cushioning foam, fabric, synthetic rubber
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
Asics Gel Resolution insoles use proprietary gel-based cushioning foam (polyurethane or similar synthetic elastomer) bonded to fabric and synthetic rubber base layers. Gel foams are chemically inert once cured and do not off-gas formaldehyde or volatile organics at room temperature. The textile cover is typically a blend of nylon or polyester with minimal finish chemicals. This material combination is standard in athletic footwear and carries no known toxicological concerns during normal use.
The brand's record and disclosure
Asics has not published detailed chemical safety disclosures or third-party certifications (such as OEKO-TEX or bluesign) for insole products, which is typical for athletic insole manufacturers. The brand has no recorded recalls or health complaints tied to insole chemical composition. Asics maintains compliance with footwear regulatory standards in major markets (EU, US) but does not voluntarily disclose material test data for this product line.
How it compares in its category
Replacement insoles from major athletic brands (Nike, Adidas, New Balance) use nearly identical gel-foam or EVA foam construction with fabric covers. Asics insoles are neither ahead of nor behind peers in chemical safety practices. Some premium competitors offer OEKO-TEX certification; Asics does not, placing it in the middle of the market for transparency but not in a safety disadvantage.
If you buy it
Store insoles in a cool, dry place away from direct heat or sunlight to preserve foam integrity; gel foams can soften above 60°C (140°F) but this is not a contamination risk. Replace when cushioning visibly compresses, typically 6-12 months of heavy tennis use. Hand-wash with mild soap if needed; do not machine wash or soak. No special handling required; normal footwear care applies.
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-releasing resins (textile finish)
Asics insole fabric covers may receive minor finishing treatments, but no formaldehyde-based resins are standard in athletic insole textiles. No recalls or complaints establish this as a risk for this product.
Azo dyes (textile coloring)
Insole covers are typically dyed with standard acid or disperse dyes. Restricted azo dyes (those that release carcinogenic amines) are prohibited under EU and US footwear regulations, which Asics follows. No evidence of non-compliance for this product.
Antimony in synthetic polymers
Antimony is used as a polymerization catalyst in some polyester and polyurethane production. Modern athletic foam manufacturing minimizes residual antimony; migration into sweat is negligible. No established hazard for insole use.
Foam degradation and microparticle shedding
Gel and synthetic foam insoles naturally degrade over time through compression and friction, potentially shedding tiny particles into socks and foot environment. This is cosmetic and mechanical rather than chemical, but prolonged use of degraded insoles should trigger replacement to maintain hygiene and support.
Adhesive or bonding agent leachables
Insole layers are typically bonded with polyurethane or contact adhesives. These cure fully before sale and do not leach into skin or sweat under normal use. No reports of irritation or chemical exposure from Asics insoles.
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.