Sof Sole · Fabric Stain Guard Sprays
Amazon.com: Sof Sole Ultra Protect Shoe Accessory, Black, 1 Medium US : Health & Household
Skip until brand discloses waterproofing chemistry
Sof Sole Ultra Protect is a shoe insert with waterproof treatment, but the brand does not disclose the coating chemistry. PFAS risk from water-repellent finishes cannot be ruled out.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Foam insole with unspecified waterproof/protective coating
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Amazon.com: Sof Sole Ultra Household is made of, ingredients and materials
Sof Sole Ultra Protect is a foam insole with an applied waterproof or protective coating, but the specific polymer or chemical composition of that coating is not publicly disclosed by the manufacturer. Foam insoles typically use polyurethane or ethylene-vinyl acetate (EVA), both common and generally low-concern base materials. The waterproofing treatment is the material variable of concern here, such coatings often rely on fluorochemicals (PFAS) or other polymers, and without ingredient transparency, end-users cannot assess exposure risk. The foam itself does not leach significantly under normal foot-temperature conditions, but degradation of the coating over time can release particles or volatile compounds.
What’s concerning
Waterproof / stain-resistant treatment
Water-repellent coating treatments have historically used PFAS.
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
PFAS
Waterproof foam insole coatings commonly use fluorochemicals (PFAS) for water resistance. Sof Sole does not disclose coating chemistry, making PFAS presence unconfirmed but not unlikely. No independent testing of this product is on public record.
Source, ATSDR ↗Coating degradation and particle release
Polyurethane and other polymer coatings on foam insoles can crack, peel, or powder with wear and heat exposure. Degradation is normal over time but may release microparticles or volatile compounds; this is not unique to Sof Sole but affects any coated insole.
Allergen contact or sensitization
Foam and coating additives (accelerators, antioxidants, tackifiers) can trigger contact dermatitis in sensitive individuals, though prevalence is low. Users with known polyurethane or acrylate sensitivities should patch-test or choose uncoated alternatives.
What’s reassuring
Formaldehyde / VOCs
Foam insole bases do not typically contain detectable formaldehyde in finished form, and isocyanate-based polyurethane foams do not off-gas at foot temperature. No recalls or adverse reports specific to this product exist on record.
Source, ATSDR ↗Heavy metals
Foam insoles do not commonly require heavy-metal pigments; black color is typically achieved with carbon black or synthetic dyes, neither of which is a known concern for foot contact. No testing or recalls involving heavy metals in Sof Sole insoles are on record.
Source, FDA ↗How is this PFAS grade calculated?
The brand's record and disclosure
Sof Sole, owned by Russell Brands (Wolverine subsidiary), does not publicly disclose waterproofing chemistry for this product line or offer certifications such as OEKO-TEX or bluesign. The brand has not issued statements on PFAS avoidance or fluorochemical policy, and product material safety data sheets are not readily available to consumers. This silence on coating composition is the primary transparency gap; competitors in the insole category vary widely in disclosure practices, with premium brands increasingly offering fluorochemical-free alternatives.
How it compares in its category
Standard uncoated foam insoles (Superfeet, Powerstep basic lines) avoid waterproofing coatings entirely and carry no PFAS concern but also no water resistance. Insoles with labeled fluorocarbon-free water barriers (some Superfeet Green, Dr. Scholl's gel variants) are available at similar price points but may be harder to find. Sof Sole's price and availability are competitive, but the lack of coating disclosure places it in a lower-transparency tier than competitors offering explicit chemical avoidance claims or third-party testing.
If you buy it
Inspect the insole monthly for peeling, cracking, or white residue, which signals coating breakdown; discard and replace if visible. Store in a cool, dry place away from direct heat (shoes left in hot cars or near radiators can accelerate polymer degradation). Do not soak or machine wash; spot-clean only with lukewarm water and mild soap, as hot water may degrade the coating faster. Replace every 6-12 months or sooner if compression or odor develops, as worn foam and worn coatings both reduce function and may release particles.
What is not known about PFAS in this product?
- Basis
- Model estimate, 42% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Sof Sole has made none
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to Amazon.com: Sof Sole Ultra Protect Shoe Accessory, Black, 1 Medium US : Health & Household?
- wax-based waterproofing
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- Respiratory irritation or fume inhalation during application
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- mink oil paste, natural oil-based conditioner
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- Microbial growth (natural oil rancidity)
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Find an alternative on Amazon- Polyester with silicone-based water-repellent coating
- The brand calls it PFAS-free, which we have not verified
- Coating degradation and microplastic shedding
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Find an alternative on AmazonMore fabric stain guard sprays 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.