TomTom · Waterproof Smartphone Cases
TomTom Runner Cardio GPS Watch
No coating described, and no PFAS statement from the brand.
The product information we reviewed describes polymer case, elastomer band, with no water-repellent coating named. Water resistance on products like this usually comes from the material and its seals rather than a surface treatment. The brand has published no PFAS statement for it.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Polymer case, elastomer band
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Elastomer band degradation and skin contact
Elastomer bands can break down with age, sweat, or UV exposure, potentially releasing micro-particles or causing contact dermatitis in sensitive users. No specific incidents recorded for this model, but common to sports watches with rubber straps.
Polymer case stress cracks and sharp edges
Polymer cases are prone to cracking after drops or prolonged pressure; sharp edges from breaks could cause minor skin abrasion. Not a chemical hazard but a mechanical wear issue typical of plastic sports watches.
Seal degradation and water ingress
Over time, elastomer seals around the case perimeter can shrink or crack, compromising water resistance and allowing moisture into electronics. This is a durability issue, not a toxicity hazard, but relevant to long-term safety.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Heavy metals
Internal circuits may contain trace metals typical of consumer electronics (solder, traces of lead historically, though RoHS restricts this in EU). No records of external leaching or surface contamination for this model; internal components do not contact skin.
Source, FDA ↗Formaldehyde / VOCs
Formaldehyde may be present in trace amounts in thermoplastic or elastomer manufacturing, but finished sports watches are not known to off-gas detectably. No reports for TomTom Runner Cardio or this material class.
Source, ATSDR ↗The full breakdown
What it's made of and why it matters
The TomTom Runner Cardio uses a polymer (plastic) case and elastomer (rubber-like) band, standard materials for GPS sports watches exposed to sweat and water. Polymer cases present minimal leaching risk under normal wear since they contact skin, not food or beverages; elastomer bands are inert and stable at body temperature. Neither material is known to degrade into microplastics under typical sports-watch use conditions (wrist-temperature exposure, no heating). The real durability concern is mechanical (coating chips, seals fail) rather than chemical.
The brand's record and disclosure
TomTom has not published specific safety statements or third-party certifications for materials used in this watch model. The company has no recorded recalls or safety alerts tied to the Runner Cardio case or band composition. PFAS grading of Excellent (75/100) reflects absence of known fluorinated coatings, yet TomTom's silence on PFAS policy means no affirmative commitment. For a consumer electronics brand, this is typical but not transparent; no controversies are established for this product line.
How it compares in its category
Sports watches in this category (polymer case, elastomer strap) are chemically similar across brands, no material advantage over competitors like Garmin or Polar. Unlike some smartwatches with decorative metal components or leather straps (which can harbor formaldehyde or dyes), this design minimizes problematic material types. The trade-off is durability, polymer cases scratch and can develop stress cracks over years, but this is not a chemical hazard. Waterproof rating (IP67 or similar) comes from design seals, not coating, so typical of the category.
If you buy it
Rinse the band with fresh water after salt-water or heavy-sweat exposure to prevent elastomer degradation and skin irritation. Do not expose to prolonged heat (sauna, dishwasher, direct sunlight in storage) as elastomer can soften. Replace the band if it shows visible cracks or becomes sticky; polymer cases should be wiped dry and stored away from heat. No special cleaning agents needed, mild soap and water is sufficient. Check the seal around the case seam annually for water ingress signs.
What we don’t know
- Basis
- Model estimate, 35% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- TomTom has made none
Formulations change between production runs, so check the current label. How we grade.
More waterproof smartphone cases 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.