Moto · Waterproof Fitness Trackers & Cases
Motorola Moto Watch 100
Smartwatch with waterproofing. PFAS content unclear due to sealing.
Motorola Moto Watch 100 is a waterproof smartwatch likely treated with water-resistant coatings, but brand provides no PFAS disclosure. No third-party testing data available.
The better-graded swap
Polar
Polar Verity Sense Optical Heart Rate Sensor
85/100 safety
Same rubric that flunked this product. The swap earned Excellent.
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Material
Stainless steel case, elastomer band, glass display with waterproof sealing
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 oligomer release
Silicone and rubber bands degrade under UV, heat, and sweat over 1-2 years of daily wear. Degraded material may release low-molecular-weight oligomers that contact skin; this is a known phenomenon in wearables but typically causes only contact irritation in sensitive individuals, not systemic toxicity.
Nickel in stainless steel (contact dermatitis risk)
Stainless steel watch cases typically contain 8-12% nickel. For individuals with nickel sensitivity, prolonged wrist contact can trigger localized dermatitis. The Moto Watch 100 uses standard stainless steel with no reported nickel-free designation; nickel leaching into skin is minimal under normal pH and non-acidic sweat conditions but possible in individuals with high sensitivity.
PFAS
Sealed smartwatch displays and casings typically use epoxy or polyurethane adhesives and hydrophobic coatings; many manufacturers use PFAS-based water repellents (per-fluorinated compounds). Motorola does not disclose the specific chemistry. No leaching into skin is expected under normal wear, but the compound is present in the device assembly.
Source, ATSDR ↗Bacterial colonization in band seams
The elastomer band, particularly where it meets the case and in the strap seams, can harbor moisture and bacteria if not rinsed regularly. This is a maintenance issue rather than a chemical hazard, but it can cause skin maceration and secondary infection in susceptible individuals.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Glass display scratching and potential silica dust
Corning Gorilla Glass or similar hardened glass is standard in smartwatches. Scratching or minor breakage does not release respirable silica dust under normal conditions; this is a durability rather than chemical safety concern.
The full breakdown
What it's made of and why it matters
The Moto Watch 100 combines a stainless steel case (chemically stable, non-leaching in normal wrist contact) with an elastomer band (typically silicone or rubber) and a sealed glass display. Stainless steel cases are among the lowest-risk wearable materials because they do not degrade or leach metals into skin even with prolonged contact or sweat exposure. The elastomer band is the primary chemical exposure vector; most silicone and rubber watch bands are free of phthalates and BPA by contemporary manufacturing standards, though this is not always disclosed.
The brand's record and disclosure
Motorola does not publicly maintain a dedicated chemical transparency or PFAS disclosure policy for wearables. No recalls or chemical safety incidents have been established for the Moto Watch 100 since its release. Motorola's parent company Lenovo has not adopted aggressive restricted substance statements typical of premium wearable brands (Apple, Garmin). The silence on PFAS content in the waterproof sealing is notable and reflects industry-wide opacity in smartwatch manufacturing.
How it compares in its category
The Moto Watch 100 is a mid-tier fitness smartwatch. Its material construction is typical, stainless steel case and elastomer band are standard across Fitbit, Garmin, and Apple Watch entry models. Unlike fashion smartwatches with nickel-plated casings or coated metal bands, this design avoids nickel sensitization risk. Chemical disclosures are poor across the category, so the Moto Watch 100 is neither ahead of nor behind peers in transparency.
If you buy it
Rinse the band with fresh water after sweat or saltwater exposure to prevent elastomer degradation and bacterial growth in the band seams. Avoid prolonged submersion beyond the rated waterproofing depth (typically 5 atm for fitness watches). Replace the elastomer band every 12-24 months if it shows visible cracking, discoloration, or odor, as degraded elastomer can release oligomers. Clean the case and band junction regularly to prevent moisture and sweat accumulation under the watch.
What we don’t know
- Basis
- Model estimate, 45% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Moto has made none
Formulations change between production runs, so check the current label. How we grade.
More waterproof fitness trackers & 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.