TX5 GTX Men's vs Men's Lunar Force 1 Duckboot: which is safer?
La Sportiva TX5 GTX Men's is our pick: better on PFAS and on the overall hazard picture.
Our pick
La Sportiva
TX5 GTX Men's
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleAzo dyes
PossibleFormaldehyde-releasing resins in finishing
PossibleAntimony in polyester
Nike
Men's Lunar Force 1 Duckboot
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleUndisclosed waterproofing chemistry (fluorinated or otherwise)
PossibleFormaldehyde resins in leather tanning and finishing
PossibleAzo dyes in leather coloring
Where these two actually differ
- We flag Azo dyes, Formaldehyde-releasing resins in finishing and Antimony in polyester on the La Sportiva and not on the Nike.
- We flag Undisclosed waterproofing chemistry (fluorinated or otherwise), Formaldehyde resins in leather tanning and finishing, Azo dyes in leather coloring and Adhesive off-gassing between layers on the Nike and not on the La Sportiva.
- The La Sportiva is synthetic textile with Gore-Tex membrane waterproof layer where the Nike is Leather upper, rubber sole, waterproof coating, which is most of the difference in these two grades.
- These two are level, close enough that price and fit should decide it rather than our grade.
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