Moto · Waterproof Fitness Trackers & Cases
Moto Watch M40 Smartwatch with Silicone Band
No coating described, and no PFAS statement from the brand.
The product information we reviewed describes silicone 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
Silicone 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.
Silicone band degradation and microfragmentation
Long-term UV and heat exposure may cause silicone to become brittle and shed small particles; however, any fragments are biologically inert and pose no chemical toxicity, only potential minor ingestion risk if not regularly inspected for visible cracking.
Bacterial and fungal growth on band
Silicone's porous surface can harbor moisture and sweat residue, creating conditions for skin flora overgrowth if the band is not dried and rinsed regularly; this is a hygiene issue (contact dermatitis risk) rather than chemical hazard.
Allergens in silicone or dyes
Silicone rubber itself is hypoallergenic, but uncured oligomers or colorant additives (e.g., azo dyes in darker bands) may trigger mild contact sensitivity in rare cases; pre-wear rinsing and spot-testing on inner wrist can mitigate risk.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Adhesive or sealant leachables in watch housing
No adhesives or sealants are specified in product documentation; typical smartwatch assembly uses minimal epoxy or urethane adhesives in sealed sections that do not contact skin.
Lead
The M40 meets RoHS and likely CE standards for electronics, which restrict these metals; however, no third-party teardown or certification document is publicly available for this specific model to confirm.
Source, ATSDR ↗The full breakdown
What it's made of and why it matters
The Moto Watch M40 uses a silicone elastomer band, which is a synthetic rubber polymer selected for flexibility, water resistance, and durability in wearables. Silicone does not leach BPA, phthalates, or heavy metals under normal skin-contact conditions, and it resists degradation from sweat and moisture. The watch body material is not specified in available product documentation, but typical Moto smartwatch housings use aluminum or stainless steel with plastic bezels, neither of which pose significant leaching risks in short-term contact.
The brand's record and disclosure
Motorola (Moto parent company) does not publish dedicated material safety or chemical disclosure statements for wearables in the public domain. No recalls or documented safety incidents are on record for the M40 band or housing. The brand's silence on PFAS and other restricted substances is typical for the smartwatch segment, where transparency lags behind cookware and apparel manufacturers; this reflects industry practice rather than unusual risk.
How it compares in its category
Silicone bands are the industry standard for fitness trackers and smartwatches, chosen precisely because they avoid phthalate-softened PVC and BPA-leaching plastics common in older wearables. The M40 sits in the mainstream mid-range; competitors like Fitbit, Garmin, and Apple Watch use identical silicone materials. The lack of stated coatings or special treatments (e.g., antimicrobial finishes) actually reduces potential hazard surfaces compared to some premium models.
If you buy it
Rinse the silicone band with fresh water after prolonged sweat or saltwater exposure to prevent bacterial biofilm buildup and odor, which are hygiene concerns, not toxicity ones. Avoid prolonged storage in direct sunlight or heat above 60 degrees Celsius, as silicone can degrade and become sticky over years of use. If the band develops cracks, permanent discoloration, or loss of elasticity after 2-3 years, replacement is advisable; official Moto bands are inexpensive. The watch body itself requires no special care beyond standard electronics handling (keep dry, avoid impacts).
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
- 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.