Pinnacle · Synthetic Athletic Insoles
Powerstep SlimTech 3/4
Limited PFAS risk, but cushioning composition unconfirmed.
Powerstep SlimTech 3/4 is an orthotic insole. Brand does not disclose foam or fabric treatments. Without public lab data or certifications, PFAS risk is moderate but not confirmed.
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Material
Foam/cushioning insole with fabric cover
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
Powerstep SlimTech 3/4 is a foam-based insole with a fabric cover, designed for arch support in shoe use. Foam cushioning in insoles is typically polyurethane or EVA (ethylene-vinyl acetate), both of which can off-gas volatile organic compounds (VOCs) during manufacturing and early use, particularly in warm or enclosed shoe environments. The fabric cover material is not specified in public data; if polyester, it may contain residual antimony (a flame-retardant catalyst) or azo dyes. No published composition breakdown from Pinnacle is readily available, which limits precise hazard assessment.
The brand's record and disclosure
Pinnacle (the parent company behind the Powerstep brand) does not publicly disclose detailed material sourcing, chemical composition, or third-party testing results for this insole product. The brand has not published certifications (e.g., OEKO-TEX, ISO 9001 for materials) that would substantiate chemical safety claims. No major recalls or established health complaints specific to SlimTech 3/4 are on record in public databases, but the lack of transparency makes independent verification difficult.
How it compares in its category
Foam insoles occupy a middle ground for chemical risk in footwear. They are lower-risk than spray-on foam treatments but higher-risk than molded rigid or gel alternatives, which off-gas less. Competitors such as Superfeet and Birkenstock more frequently publish material certifications and sourcing information. SlimTech 3/4's generic foam composition and absent labeling place it below the transparency standard of certified alternatives in the premium insole market.
If you buy it
Air out new insoles for 24-48 hours before extended wear to allow initial VOC release in a ventilated space, not inside a sealed shoe. Inspect the fabric cover for loose dyes or deterioration; replace the insoles every 12-18 months or when cushioning visibly compresses, as degraded foam may shed microparticles. Avoid exposing them to sustained heat (e.g., direct sunlight in a car) to slow chemical breakdown. If you experience skin irritation or respiratory symptoms after insertion, discontinue use and consider a certified alternative.
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.”
VOC off-gassing from polyurethane or EVA foam
Foam cushioning cores commonly release volatile organic compounds (toluene, formaldehyde, benzene) during manufacture and early use. In a warm, enclosed shoe environment, this off-gassing may concentrate and persist for weeks. Pinnacle provides no off-gas testing data or foam cure time disclosure.
Azo dye or residual dye migration from fabric cover
If the fabric cover is synthetic (likely polyester) and untested for dye stability, sweat and moisture inside the shoe could mobilize azo dyes or other synthetic colorants. Skin contact with feet (which are occluded and warm) increases dermal absorption risk. No dyestuff specification is published.
Antimony residue in polyester fabric (if present)
Polyester fabrics sometimes retain trace antimony from polyester synthesis. While antimony leaching into skin is low, prolonged contact with sweaty feet and warm conditions may increase bioavailability. Material composition is unconfirmed for this product.
Microparticle shedding from degraded foam
Over time, foam cushioning breaks down mechanically and chemically. Fragmented foam particles may become airborne or ingested via hand-to-mouth contact, particularly in users who handle the insole during cleaning or replacement. No durability or shedding testing is published.
Contact dermatitis from uncertified materials or processing residues
No specific dermatitis reports are on record for SlimTech 3/4. However, absence of material certifications (OEKO-TEX) and public allergy testing means residual processing chemicals (e.g., catalyst residues, release agents) cannot be ruled out.
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 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.