TX5 GTX Men's vs Men's Moab 3 8" Tactical Zip Waterproof Boot: 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

F 20/100

Overall grade

F 8/100

Verdict

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Hazard flags

⚑ 3

Material

synthetic textile with Gore-Tex membrane waterproof layer

Confidence

45%

PossibleAzo dyes

PossibleFormaldehyde-releasing resins in finishing

PossibleAntimony in polyester

Why this grade

Merrell

Men's Moab 3 8" Tactical Zip Waterproof Boot

PFAS grade

F 20/100

Overall grade

F 0/100

Verdict

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Hazard flags

⚑ 4

Material

Leather/synthetic upper with proprietary waterproof membrane

Confidence

35%

PossibleFormaldehyde resins in synthetic uppers and linings

PossibleWaterproof membrane degradation and microparticle shedding

PossibleAzo dyes in leather or synthetic upper colorants

Why this 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