Coros · Waterproof Fitness Trackers
Coros Nomad GPS Watch
GPS sports watch with waterproof treatment; PFAS risk unclear without material disclosure.
Coros does not disclose PFAS in materials or water-resistant treatments. Waterproof coatings on electronics commonly use Teflon-family coating. No independent testing or certification available.
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 band, waterproof 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 Coros Nomad uses a stainless steel case, which is chemically inert and does not leach metals under normal wear conditions. The elastomer band (rubber-based polymer) poses minimal toxicity risk during skin contact under standard use. The critical unknown is the waterproof coating applied to the watch: Coros has not publicly disclosed whether this uses PFAS-based water-repellent coating (water-repellent coating) treatments, which are common in sports watches but carry environmental and bioaccumulation concerns. Without material specification, the actual chemical hazard profile cannot be fully assessed.
The brand's record and disclosure
Coros is a smaller sports watch manufacturer and has not published comprehensive material safety disclosures, supply chain certifications, or explicit PFAS avoidance policies comparable to larger outdoor brands. No significant recalls or safety controversies are publicly documented for the Nomad line. The brand's silence on waterproof coating chemistry is typical for the GPS sports watch category but reflects a general lack of transparency rather than evidence of unsafe practices. Contact with Coros support does not reliably yield detailed material specifications.
How it compares in its category
GPS sports watches universally require waterproof coatings to function reliably; the Nomad is typical in this respect and not an outlier for hazard risk. Larger competitors (Garmin, Apple Watch) also do not publicly disclose PFAS use in water-resistant treatments. Stainless steel cases are industry standard and safer than plastic housings. The Nomad's elastomer band is less prone to off-gassing than silicone or leather alternatives, placing it in the middle-to-safer range for wearables.
If you buy it
Wear the watch as designed without modification; do not disassemble or expose the internals to heat or solvents, which could degrade coatings. Clean the band periodically with mild soap and water to remove sweat and skin residue that can accumulate under prolonged wear. Replace the elastomer band if it shows visible cracking, peeling, or discoloration, as degradation could release polymeric particles. The stainless steel case itself requires no special care and will not degrade under normal use.
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.”
Waterproof coating (water-repellent coating/Teflon-type coating analogs)
GPS sports watches typically use fluorinated water-repellent coatings (often PFAS-based or PFOA alternatives); Coros Nomad material data sheet does not specify the type, making PFAS exposure risk unclear without direct manufacturer inquiry.
Elastomer band degradation
Coros elastomer bands are not reported to off-gas volatile compounds or leach phthalates under normal skin-contact conditions; degradation over 2-3 years is cosmetic rather than hazardous, but worn material should be replaced.
Stainless steel leaching (nickel)
Stainless steel cases are passivated and do not leach nickel at appreciable levels during normal wear; users with nickel hypersensitivity may experience localized dermatitis from prolonged contact, but this is a skin sensitivity issue, not product contamination.
Electronic component toxins (solder, internals)
The Nomad, like all modern GPS watches, uses lead-free solder in internal circuitry; no internal toxic components have been documented, and the sealed case prevents exposure during normal use.
Fragrance or adhesive residue
No formaldehyde-releasing adhesives or fragrance treatments are typical in GPS watch manufacturing; the Nomad carries no known exposure to cosmetic-grade chemical hazards.
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.
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.