Danner Men's Free Spirit
Skip until Danner discloses waterproof treatment chemistry.
Danner Free Spirit is a waterproof hiking boot with an unspecified water-repellent coating finish. The brand does not disclose PFAS status; many leather boots use PFAS-based water repellents.
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Material
leather, nylon, rubber sole with water-repellent coating treatment
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Danner Men's Free Spirit is made of, ingredients and materials
The Free Spirit combines full-grain leather uppers with nylon panels and a rubber sole treated with water-repellent coating (water-repellent coating) finish. Leather itself carries minimal chemical hazard when untreated, but the water-repellent coating treatment on the nylon and possibly leather is where PFAS or other water-resistant chemicals enter the picture. Nylon base material is not known to off-gas formaldehyde or volatile compounds under normal wear conditions. The rubber sole is the primary source of potential off-gassing, though modern athletic-grade rubber soles are generally below concerning VOC thresholds.
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
Danner has not disclosed the chemistry of the water-repellent coating applied to nylon panels and possibly leather. Industry standard for this price point and waterproofing claim is fluorinated water-repellent coating, which typically contains PFOA or PFOS relatives. This is the primary hazard for this product and Danner's silence compounds the concern.
Source, ATSDR ↗Azo dyes in nylon or leather
Nylon panels and leather uppers may be dyed with azo dyes, which can release carcinogenic amines under sweat or heat conditions. Danner does not publicly disclose dye chemistry. Risk is low in normal outdoor use but present if boot is worn frequently in hot, sweaty conditions or if leather is heavily pigmented.
Rubber sole VOC off-gassing
New rubber soles can emit volatile compounds including sulfur-based odors and trace VOCs. This is typically strongest in the first few days to weeks of wear and dissipates with airing. No specific testing of the Free Spirit's sole chemistry is publicly available.
What’s reassuring
Formaldehyde / VOCs
No evidence of formaldehyde-resin finishes reported on Danner boots. Nylon itself does not require formaldehyde curing. Leather tanning may use chromium or vegetable methods, but formaldehyde crosslinking is not a standard part of modern Danner construction.
Source, ATSDR ↗Lead
No recalls or testing indicating heavy metal contamination in Danner leather boots. Modern tanneries in developed supply chains typically do not use lead or cadmium, though Danner does not publicly disclose supplier audits or metal testing for this model.
Source, ATSDR ↗The full breakdown
The brand's record and disclosure
Danner is a heritage outdoor footwear brand owned by LaCrosse Footwear (itself owned by Wolverine World Wide). The company has not published detailed chemistry disclosures regarding its water-repellent coating treatments or undertaken public PFAS reduction commitments comparable to industry leaders like Patagonia or Salomon. No major recalls involving chemical hazards have been established for this model. Danner's silence on waterproofing chemistry is notable in an industry where other brands now disclose PFAS-free alternatives.
How it compares in its category
Most mid-range waterproof leather hiking boots use fluorinated water-repellent coating (PFAS-based) as a default, making the Free Spirit typical rather than distinctive. Competitors like Salomon and some Merrell lines now offer PFAS-free water-resistant options using wax, oil, or fluorine-free polymer coatings. Danner's refusal to disclose treatment chemistry places it in the less transparent segment of the market. For a premium-priced boot, the lack of public commitment to safer chemistry is a competitive weakness.
If you buy it
Condition the leather regularly with beeswax or lanolin-based products rather than silicone sprays, which can build up occlusive layers. Avoid prolonged exposure to direct heat sources (radiators, car heaters) as the nylon and glues can degrade. Replace the boot if the sole delaminates or visible cracks appear in seams, as these signal breakdown of internal waterproofing structures. If the water-repellent coating beading diminishes after 12-18 months, use a fluorine-free or PFAS-free refresh product if available, or accept reduced water repellency rather than reapplying PFAS-containing treatments.
What we don’t know
- Basis
- Model estimate, 35% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Danner 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.