Fossil · Waterproof Fitness Trackers
Fossil Men's Explorist HR Gen 4 Smartwatch FTW
Smartwatch with water-resistant coating; no PFAS transparency from Fossil.
Water-resistant smartwatches often use fluorochemical coatings, but Fossil discloses nothing about PFAS in this model. Public information insufficient to assess definitively.
The safe swap
Withings
Withings BeamO 3-in-1 Health MultiScan
100/100 safety
Same rubric that flunked this product. The swap earned its A.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
stainless steel case, elastomer strap, glass screen with water-resistant coating
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
other 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 Explorist HR Gen 4 uses a stainless steel case, which is chemically stable and does not leach metals under normal wear. The elastomer strap (likely silicone or synthetic rubber) is a low-toxicity material for skin contact, with no known lead or cadmium issues in this material class. The glass screen includes a water-resistant coating of undisclosed composition, which is the primary concern; such coatings sometimes rely on Teflon-family coating or siloxanes, but Fossil has not published material specifications. Overall, the core materials are conventional and pose minimal hazard during normal use.
The brand's record and disclosure
Fossil has not published detailed material safety disclosures or PFAS policies, and has remained silent on the composition of water-resistant coatings used in its smartwatches. The brand holds no known third-party environmental or chemical certifications (such as Bluesign or Oeko-Tex) for consumer electronics. No public recalls or regulatory actions specific to the Explorist line or Fossil smartwatches have been documented. This lack of transparency limits independent verification of coating chemistry and processing residues.
How it compares in its category
Smartwatches as a category involve minimal skin contact and are not heated or ingested, placing them lower-risk than cookware or personal care products. Most mainstream smartwatch brands (Garmin, Fitbit, Apple) similarly do not disclose water-resistant coating chemistry in public materials. The stainless steel and elastomer combination is standard across mid-market brands; no material advantage or disadvantage is evident for the Explorist HR Gen 4 relative to peers. The water-resistant coating remains the differentiating concern, but is typical for the product type.
If you buy it
Wash the strap periodically with mild soap and water to remove skin oils and sweat, which can degrade elastomer over time. Avoid prolonged immersion in saltwater or chlorinated pools beyond the stated water resistance (typically 3-5 ATM for this model), as coatings can erode. Do not expose to extreme heat or direct sunlight for extended periods, as elastomer and coatings may become brittle. Replace the strap if visible cracking or discoloration occurs, and consider a new device if the screen coating flakes or peels, as exposed glass may harbor bacteria in crevices.
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.”
Water-resistant coating composition (Teflon-family coating or siloxane risk)
Fossil does not disclose the active chemistry of the screen coating; if Teflon-family coating-based, it may contain or release PFAS precursors during manufacturing or degradation. If siloxane-based, long-term bioaccumulation risk is low but not excluded. No independent test data for this specific product is available.
Elastomer strap degradation and microparticle release
Elastomer straps on smartwatches can break down from UV exposure, sweat, and repeated flexing, potentially releasing small particles into skin. The Explorist HR Gen 4 strap material specifications do not clarify if it contains plasticizers or flame retardants. Risk is low under normal use but increases if the strap is worn 24/7 without cleaning.
Stainless steel nickel leaching (skin contact)
Surgical-grade stainless steel (typically 316L or 304) used in smartwatch cases leaches negligible nickel under normal skin contact. No nickel sensitivity issues have been reported for this product line. Risk applies primarily to individuals with documented nickel allergy, who should test with a patch before extended wear.
Glass screen durability and contamination
Scratched or cracked glass can trap bacteria and skin cells in crevices, and the water-resistant coating may degrade unevenly, exposing substrate. The Explorist HR Gen 4 does not specify glass type (Gorilla Glass or generic) or coating durability rating. Inspect regularly and avoid contact with abrasive surfaces.
Battery and electronic component off-gassing
Smartwatch batteries and circuit boards are sealed within the case and do not off-gas into the air or contact skin. No volatile organic compounds or formaldehyde issues have been reported for Fossil smartwatch electronics. Risk is confined to manufacturing emissions, which are outside the consumer product scope.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 35% 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.
Safer alternatives in Waterproof Fitness Trackers
Withings
BeamO 3-in-1 Health MultiScan
Medical-grade stainless steel, plastic housing, medical sensors
Medical device with inherently low PFAS risk profile.
✓Naturally PFAS-free material
Whoop
Peak Health and Fitness Wearable 12-Month Membership
silicone band, electronics, stainless steel hardware
Wearable membership with minimal PFAS risk indicators.
⚠Brand says nothing about PFAS
Whoop
MG Navigator Band
Elastomer band (silicone-based or similar)
Lower concern fitness band, but brand silence on materials limits certainty.
⚠Brand says nothing about PFAS
More waterproof fitness trackers 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.