Lowa Men's Zephyr GTX Mid TF
Unknown PFAS risk; Lowa discloses no waterproofing chemistry or water-repellent coating details.
Lowa Zephyr GTX uses Gore-Tex for waterproofing and likely contains a water-repellent coating finish, but the brand does not disclose PFAS status or specific coating treatments. No independent lab data or certifications available.
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Material
Textile upper with Gore-Tex GTX membrane, likely water-repellent coating-treated
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Lowa Men's Zephyr GTX Mid TF is made of, ingredients and materials
This boot uses a textile upper paired with Gore-Tex GTX membrane, a laminated polyurethane-based waterproofing layer bonded to fabric. The outer textile is treated with a water-repellent coating (water-repellent coating) finish to shed water before it reaches the membrane. Lowa does not publicly disclose the chemical composition of its water-repellent coating treatment or confirm whether it contains legacy or newer PFAS variants. Gore-Tex itself does not inherently contain PFAS, but the water-repellent coating finish applied to textiles in this product category historically relies on fluorinated chemistry.
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.
water-repellent coating (water-repellent coating) fluorinated chemistry
Gore-Tex paired with fluorinated water-repellent coating is industry standard; Lowa does not disclose whether its water-repellent coating formulation uses legacy PFOA/PFOS, other long-chain PFAS, or newer short-chain alternatives. Risk level cannot be determined from public information.
Gore-Tex membrane degradation and microplastic shedding
Gore-Tex polyurethane membranes can degrade over time, especially with mechanical flexing, heat, and sunlight exposure. Microfiber shedding from worn Gore-Tex membranes has been documented in peer literature, though clinical risk remains unclear. Replacement or repair of boots before advanced deterioration mitigates exposure.
What’s reassuring
Formaldehyde / VOCs
No formaldehyde-related recalls or reports exist for Lowa footwear. Textile finishing for hiking boots does not typically require formaldehyde; Gore-Tex lamination does not introduce formaldehyde as a byproduct.
Source, ATSDR ↗Azo dyes and restricted colorants
Lowa is a German-manufactured product subject to EU textile regulations (REACH, OEKO-TEX scope). No azo dye violations or heavy metal dye contamination has been reported for Lowa boots.
Antimony in polyester components
If polyester is present in lining or secondary components, antimony trioxide may be used as a catalyst; no testing data or violations specific to Lowa boots are on record. Antimony exposure from wearing textiles is considered negligible by health agencies.
The full breakdown
The brand's record and disclosure
Lowa is a German hiking boot manufacturer with no known major safety recalls or public controversies tied to formaldehyde, azo dyes, or heavy metal contaminants in their footwear. However, the company does not publicly disclose waterproofing chemistry, PFAS phase-out timelines, or third-party testing results for water-repellent coating treatments. This silence on PFAS policy contrasts with competitors like Salomon and Arc'teryx, which have published commitments to reduce or eliminate fluorinated water-repellent coating. No independent lab testing of Lowa boots for PFAS content has been published in peer-reviewed sources.
How it compares in its category
Most hiking boots in this price and performance tier use Gore-Tex with fluorinated water-repellent coating finishes; Lowa's positioning is typical for the segment. Brands such as Salewa and Hanwag offer similar GTX-lined boots with equal transparency gaps. A small number of alternatives (e.g., some Danner or KEEN models) market fluorine-free water-repellent coating or explicitly state PFAS-free status, though these remain niche. The Zephyr GTX Mid TF is neither an outlier for concern nor a leader in transparency.
If you buy it
Wash the boot's exterior periodically with mild soap and cool water to remove dirt and slow water-repellent coating degradation; avoid machine washing or high heat, which can damage the Gore-Tex membrane. Reapply a fluorine-free water-repellent coating product (e.g., wax-based) every 12-18 months or when water no longer beads on the surface; this reduces reliance on the original factory finish. Store in a cool, dry location away from direct sunlight. Replace the boot when the sole shows significant wear or the Gore-Tex begins leaking, typically after 400-600 miles of hiking.
What we don’t know
- Basis
- Model estimate, 45% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Lowa 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.