Men's Zephyr GTX Mid TF vs Men's Killington Trekker Sneaker Boots: which is safer?
These two grade almost identically. Pick on price and preference; neither has a PFAS edge.
Lowa
Men's Zephyr GTX Mid TF
PFAS grade
F 20/100
Overall grade
F 0/100
Verdict
Skip
Hazard flags
⚑ 5
Material
Nubuck leather upper, Gore-Tex GTX membrane (Teflon-family coating-based waterproof liner)
Confidence
45%
LikelyTeflon-family coating (PFAS-bearing) waterproof membrane
PossibleFormaldehyde in leather tanning and finishing
PossibleAzo dyes in leather and fabric dyeing
Timberland
Men's Killington Trekker Sneaker Boots
PFAS grade
F 20/100
Overall grade
analysis pending
Verdict
pending
Hazard flags
none flagged
Material
Leather, nubuck, rubber sole with waterproof treatment
Confidence
45%
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 hiking shoes & trail runners: see the full ranking