Asolo Women's Stynger GTX
Skip until Asolo discloses water-repellent coating chemistry or commits PFAS-free.
This hiking boot uses Gore-Tex for waterproofing, typically lined with Teflon-type coating-based membrane. Asolo provides no PFAS disclosure. water-repellent coating finish composition on the nylon upper is unstated.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Nylon/polyester fabric with Gore-Tex membrane, water-repellent coating treatment unspecified
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Asolo Women's Stynger GTX is made of, ingredients and materials
The Stynger GTX pairs nylon and polyester outer fabrics with a Gore-Tex waterproof-breathable membrane. The water-repellent coating (water-repellent coating) finish is not specified by Asolo. Gore-Tex membranes have historically relied on Teflon-type coating (Teflon), and water-repellent coating treatments on outdoor textiles are predominantly fluorinated compounds (PFAS). Without Asolo's explicit confirmation of non-fluorinated alternatives, the product is likely treated with legacy PFAS-based water repellents.
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.
Azo dyes in polyester/nylon
Polyester and nylon in outdoor footwear are commonly dyed with azo colorants. No restriction-list certification is on record for this product; use of banned azo dyes is possible but not confirmed.
Antimony in polyester
Polyester yarn may contain antimony as a catalyst residue from production. Asolo does not disclose antimony testing or limits; migration risk is low during wear but cannot be ruled out without material sourcing data.
VOC and off-gassing from synthetic adhesives and Gore-Tex
Gore-Tex laminates and boot assembly adhesives may release VOCs during the break-in period. Off-gassing is typically mild in outdoor boots but higher in newly manufactured units; odor-reduction happens within weeks of airing.
What’s reassuring
Formaldehyde / VOCs
No formaldehyde-resin finish or wrinkle-resistant treatment is reported for this boot. Gore-Tex and water-repellent coating treatments do not typically involve formaldehyde, so concern is not elevated on available information.
Source, ATSDR ↗Flame retardants
No flame retardant finish is typical for hiking boots. Gore-Tex itself is not flame-treated; concern is not elevated unless the insole or lining is noted to carry a finish.
Source, EPA ↗The full breakdown
The brand's record and disclosure
Asolo has not published a PFAS disclosure or commitment to fluorine-free water-repellent coating. The brand has no publicly recorded certifications (Bluesign, GOTS, or similar) that would limit synthetic chemical use. This silence on chemistry is the default position for many outdoor footwear makers, but it leaves the wearer and end-of-life handler without transparency on persistent contaminants.
How it compares in its category
Most Gore-Tex hiking boots carry the same PFAS exposure risk as the Stynger GTX unless the maker explicitly states non-PFAS water-repellent coating. Some competitors (e.g., Salomon, La Sportiva in select lines) have begun offering PFAS-free or reduced-fluorine options or third-party verified certifications. The Stynger GTX sits in the mainstream, unaudited category where PFAS presence is possible but not disclosed.
If you buy it
Wash the boot uppers separately from other garments to minimize PFAS transfer to household water if you choose to purchase. Air-dry only; heat weakens Gore-Tex and can accelerate water-repellent coating breakdown. Replace when the membrane delaminates or water begins to soak through, not just when the sole wears. Avoid tumble-drying or machine washing at high temperatures.
What we don’t know
- Basis
- Model estimate, 42% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Asolo has made none
Formulations change between production runs, so check the current label. How we grade.
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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.