Coros · Waterproof Fitness Trackers
COROS VERTIX 2S Adventure GPS Watch
No PFAS disclosure. Waterproof coating unspecified, higher concern.
COROS does not publicly disclose PFAS use or avoidance for the Vertix 2S. The waterproof coating composition is not stated, making PFAS risk assessment difficult. Contact the brand directly for material details.
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, synthetic composite band, unspecified 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 VERTIX 2S uses a stainless steel case, which is chemically inert and poses no leaching risk under normal wear. The synthetic composite band is the primary concern: composition is not publicly detailed by COROS, but likely comprises polyurethane, silicone, or mixed polymers common in sports watch bands. The waterproof coating applied to seams and electronics is unspecified, which is the material safety gap here, as some water-resistant coatings historically relied on fluorinated compounds for durability.
The brand's record and disclosure
COROS has not publicly disclosed material composition details or third-party testing certifications for chemical safety on their product pages. The company maintains silence on PFAS use and does not advertise compliance with restricted substance standards (OEKO-TEX, bluesign, or similar). No significant product recalls related to toxicity have been published; however, absence of disclosure is not the same as absence of risk and reflects limited transparency typical of smaller sports-tech brands.
How it compares in its category
GPS sports watches vary widely in material transparency. Competitors like Garmin and Suunto provide more detailed material datasheets and some certifications, though few sports watches routinely disclose waterproof coating composition. Stainless steel cases are industry standard and safe; the synthetic band is typical for the segment. COROS ranks below leaders in material transparency but is not an outlier in failing to specify coating chemistry.
If you buy it
Stainless steel components require minimal care beyond occasional cleaning with water and mild soap. The synthetic band should be rinsed after salt water or chlorine exposure to extend life; do not expose to extreme heat (above 65°C/150°F). Monitor the band annually for discoloration, stiffness, or degradation, which could indicate polymer breakdown; replacement bands are available separately. Keep away from strong solvents and sunscreen that may degrade the band polymer over years of 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 composition (unspecified fluorinated or silicone-based)
COROS does not publicly name the waterproof coating chemistry. Fluorinated coatings used in sports watch sealing could contain PFAS (addressed separately). Silicone coatings are safer but also unconfirmed here.
Synthetic band polymer degradation and microplastic shedding
No recalls or reports of the VERTIX 2S band degrading prematurely or shedding microplastics. However, composition is unspecified, so long-term durability profile cannot be independently verified.
Stainless steel case leaching
Stainless steel is chemically stable and does not leach nickel or chromium under normal skin contact; this hazard class is not a concern for this material.
Adhesives or bonding agents in band assembly
Assembly adhesives in watch bands are not typically disclosed and could include volatile organics, but COROS has no reported incidents; risk is theoretical and low for a sealed wearable.
Battery safety and material compatibility
The VERTIX 2S uses a rechargeable lithium battery sealed within the case. No reported safety issues; standard for the product category and not a direct skin contact hazard.
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.