Merrell · Waterproof Boots
Merrell Men's Moab 3
Hiking shoe with likely water-resistant treatment, PFAS status unclear.
Merrell's Moab 3 uses standard water-repellent coating coatings on outdoor footwear, typical in the category. Brand makes no PFAS disclosure; treatment chemistry unknown publicly.
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Material
Mesh/synthetic leather upper with water-repellent coating-treated footwear
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 Moab 3 upper combines mesh (likely polyester/nylon) with synthetic leather panels, standard for hiking shoes. The shoe carries a water-repellent coating (water-repellent coating) finish on the outer fabric to shed moisture. water-repellent coating treatments are the primary PFAS exposure vector in footwear; older formulations used long-chain PFAS, though many brands have shifted to shorter-chain or non-fluorinated alternatives. The midsole and outsole are rubber-based compounds, which carry low inherent toxicity but degrade and shed microplastics over heavy use.
The brand's record and disclosure
Merrell (owned by Wolverine World Wide) has not published detailed PFAS phase-out commitments or water-repellent coating supply chain transparency for consumer footwear, unlike brands such as Patagonia or The North Face. The company maintains general sustainability messaging but does not disclose which PFAS variants (if any) are used in water-resistant treatments. No significant chemical safety recalls have been recorded for the Moab line. Without explicit commitment to PFAS-free alternatives, the water-resistant coating status remains opaque.
How it compares in its category
The Moab 3 is a mainstream comfort-focused hiking shoe; it sits mid-market in terms of material disclosure. Competitors like Salomon and La Sportiva similarly do not consistently publish PFAS details, though brands explicitly targeting PFAS reduction (Meindl, some Vasque models) are available at comparable or slightly higher cost. The Moab's mesh-heavy construction and modest water-treatment footprint place it below heavier synthetic-leather alternatives (e.g., full-grain leather boots), which may carry different chemical burdens. For typical day-hike or light backpacking use, durability is strong.
If you buy it
Avoid machine washing; clean with a soft brush and mild soap to preserve the water-repellent coating and prevent accelerated breakdown of synthetic materials. Store in a cool, dry place away from direct heat or UV, which degrade the mesh and adhesive bonds over time. The shoe's lifespan is typically 300-500 miles of active use before sole compression and upper fatigue warrant replacement. If the water-repellent finish degrades noticeably (water no longer beads), the coating has worn through; reapplication with aftermarket water-repellent coating spray is an option but reintroduces chemical exposure.
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.”
PFAS in water-resistant (water-repellent coating) coating
water-repellent coating treatment on mesh/synthetic leather uppers is a known PFAS application in footwear. Merrell has not disclosed whether the Moab 3 uses legacy long-chain PFAS or newer alternatives; assume possible contamination until verified by the brand.
Synthetic leather off-gassing (VOCs) and degradation
Polyurethane or PVC synthetic leather can emit volatile organic compounds during break-in and when exposed to heat. This is minor for footwear worn outdoors, but new-shoe odor is a recognized off-gassing indicator. Degradation of synthetic materials over time may release microplastics into soil/water if shoes are discarded.
Azo dyes or dye residues in mesh and synthetic panels
Merrell does not publish specific dye chemistry for the Moab line. Most mainstream polyester mesh footwear uses regulated azo dyes, but no third-party testing or recalls are on record for the Moab 3 specifically. Risk is low in normal wear but present in manufacturing and disposal.
Rubber midsole and outsole degradation (microplastics)
Rubber soles shed particles with heavy use, particularly in traction patterns and heel strike zones. Outdoor trail wear accelerates this; microplastics are released into soil and water. This is inherent to any rubber-soled footwear and not unique to Merrell but relevant to overall product lifecycle impact.
Adhesive residues and off-gassing (glue, midsole bond)
Shoe construction relies on polyurethane adhesives to bond upper, midsole, and outsole. New shoes may off-gas volatile compounds from these adhesives. Prolonged exposure to heat or humidity can weaken bonds, leading to sole separation and potential inhalation of adhesive fumes during re-gluing attempts.
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 waterproof boots 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.