Men Mephisto Curt Mt SNEAKER vs Men's Thunder GTX: which is safer?
Men Mephisto Curt Mt SNEAKER is our pick: better on PFAS and on the overall hazard picture.
Our pick
Mephisto
Men Mephisto Curt Mt SNEAKER
PFAS grade
Good 65/100
Overall grade
Good 59/100
Verdict
Skip
Hazard flags
⚑ 1
Material
leather, textile, rubber sole
Confidence
55%
PossibleVolatile organic compounds (VOC) off-gassing from adhesives
Zamberlan
Men's Thunder GTX
PFAS grade
Bad 20/100
Overall grade
Bad 0/100
Verdict
Skip
Hazard flags
⚑ 5
Material
Leather/textile upper with Gore-Tex membrane (waterproof lining)
Confidence
45%
PossibleFormaldehyde resins in leather tanning and dye fixation
PossibleAzo dyes and heavy metal traces in colorants
LikelyGore-Tex PFAS presence (non-PFAS chemistry concerns)
Where these two actually differ
- We flag Volatile organic compounds (VOC) off-gassing from adhesives on the Mephisto and not on the Zamberlan.
- We flag Formaldehyde resins in leather tanning and dye fixation, Azo dyes and heavy metal traces in colorants, Gore-Tex PFAS presence (non-PFAS chemistry concerns) and Adhesive and seam-tape off-gassing on the Zamberlan and not on the Mephisto.
- The Mephisto is leather, textile, rubber sole where the Zamberlan is Leather/textile upper with Gore-Tex membrane (waterproof lining), which is most of the difference in these two grades.
- The gap is 45 points, wide enough that this is not a close call, and the Mephisto is the one to buy.
Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
More waterproof boots: see the full ranking