HOKA · Hiking Shoes & Trail Runners
Hoka Men's Kaha 3 Low GTX
GORE-TEX uses legacy PFAS; Hoka provides no transparency on alternatives.
Hoka's Kaha 3 Low GTX uses GORE-TEX for waterproofing, which historically contains PFAS. Hoka does not disclose PFAS status or offer PFAS-free alternatives in this line.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Leather/textile upper with GORE-TEX waterproof membrane
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Waterproof / stain-resistant treatment
water-repellent coating treatments have historically used PFAS.
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
The Kaha 3 Low GTX pairs a leather and textile upper with GORE-TEX lining, a microporous membrane that repels water while allowing vapor to escape. GORE-TEX traditionally uses perfluorinated compounds (legacy PFAS) to achieve this hydrophobic effect, though GORE-TEX has introduced some non-PFAS variants in recent years. The leather upper may be treated with synthetic tannins or chrome tanning agents, and textile components are typically dyed with azo or reactive dyes. The midsole and outsole use rubber or polyurethane compounds that can off-gas volatile organic compounds (VOCs) during the break-in period.
The brand's record and disclosure
Hoka (owned by Decathlon group) has not published detailed transparency reports on PFAS use or alternatives in their footwear lines. The brand does not appear on public PFAS-committed company lists (like the ZDHC Gateway or similar initiatives). No major recalls or hazard allegations specific to Hoka footwear have been widely documented. The silence itself is notable: competitors like Salomon and some Nike lines have begun disclosing PFAS content or committing to phase-out timelines.
How it compares in its category
The Kaha 3 is a premium trail running shoe competing with brands like Salomon, La Sportiva, and ASICS. Most shoes in this category still rely on GORE-TEX or similar PFAS-containing waterproofing membranes; truly PFAS-free alternatives (such as Paragon or newer bluesign-certified systems) remain rare and cost-premium. Hoka's price point and market positioning suggest standard industry practice, not a leader in chemical reduction. The textile and leather sourcing appear unremarkable for the category, with no standout certifications (such as Leather Working Group or bluesign).
If you buy it
Allow 24-48 hours for off-gassing of the new shoe in a well-ventilated space before extended wear, especially if you have chemical sensitivities. Avoid washing at high heat; hand wash with mild soap and air dry. The GORE-TEX membrane will degrade over 300-500 miles of use; replacement is not practical, so plan for retirement once waterproofing fails. Store in a cool, dry place away from direct sunlight to slow polyurethane degradation.
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.”
Azo dyes in textile upper
Textile upper and lining are likely dyed with azo or reactive dyes, which may contain trace heavy metals (lead, cadmium) or allergens in rare cases, though well-regulated manufacturers typically comply with restricted substance limits. No specific testing of this model is on record.
VOC off-gassing from midsole/adhesives
Polyurethane midsoles and shoe adhesives commonly release VOCs (such as toluene, xylene, or MDI) during the first 1-2 weeks. This is standard for almost all athletic footwear and dissipates with ventilation.
Chrome tanning residues in leather
If the leather upper uses chrome tanning (common for durability), trace chromium compounds may leach slightly with prolonged moisture exposure, though the risk to skin contact is low for finished leather products. Tannery practices vary widely.
GORE-TEX membrane degradation over time
The polyurethane-based GORE-TEX membrane loses waterproofing efficiency after 300-500 miles of use and cannot be refreshed or replaced without full shoe reconstruction. This is not a toxicity hazard but an efficacy and waste concern.
Formaldehyde in textile sizing or finishes
Textile components may be treated with formaldehyde-based resins for shape retention or wrinkle resistance during manufacturing. Most major brands comply with apparel safety limits, but no public testing of this specific model exists.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 45% 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 hiking shoes & trail runners 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.