Coros · Water-Resistant Smart Rings & Bands
COROS Silicone Watch Band For COROS Smartwatch Unisex Waterproof Strap Light Green / 20mm
No coating described, and no PFAS statement from the brand.
The product information we reviewed describes silicone elastomer, 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 elastomer
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What COROS Silicone Watch Band For COROS is made of, ingredients and materials
This is a silicone elastomer strap, a polymer chain of silicon and oxygen atoms commonly used in wearables because it resists moisture, UV, and temperature swings without brittling. Silicone does not leach BPA, phthalates, or other plasticizers the way some polyvinyl chloride (PVC) or polyurethane bands do. The light green color is achieved via pigment additives mixed into the base polymer during manufacturing; no coating is described, so degradation into microplastics is a slower, long-term concern than with surface finishes that flake.
What’s concerning
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
PFAS
Light green pigmentation is typical in silicone bands. Standard iron oxides or organic pigments used in FDA-compliant silicone rarely migrate to skin at room temperature, but prolonged contact with sweat or alcohol-based hand sanitizers may increase minor transfer. No brand disclosure or test data is available for this specific product.
Source, ATSDR ↗Microplastic generation from wear
All silicone elastomers degrade under UV and mechanical stress over time, potentially shedding small fragments. The rate and significance for a watch band worn on skin is low compared to larger silicone items, and fragments are not expected to be ingested or accumulated in tissue.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Adhesive or connector leachables
The band's junction with the metal or plastic watch connector may contain epoxy or urethane adhesive not explicitly disclosed. COROS does not publish adhesive composition. Skin contact is minimal and localized; no hazard reports exist for this product line.
Formaldehyde / VOCs
Modern silicone elastomers do not require formaldehyde-based cross-linkers; platinum or peroxide catalysts are standard. No formaldehyde off-gassing is expected, and the material is not a textile that would retain resin finishes.
Source, ATSDR ↗Heavy metals
FDA-compliant silicone colorants for consumer wearables are formulated to exclude cadmium, lead, and chromium. COROS is subject to US Consumer Product Safety Commission rules; no contamination reports are on record. Silicone itself does not accumulate metals during polymerization.
Source, FDA ↗The full breakdown
The brand's record and disclosure
COROS is a sports-watch and fitness wearable brand without widely publicized material safety certifications or third-party testing disclosures for their bands. The brand has not issued a public PFAS statement for this product line. No recalls or regulatory actions specific to COROS watch bands have appeared in public databases. Standard silicone elastomers do not require PFAS stabilizers, making the silent stance less concerning than it would be for a coating-heavy product.
How it compares in its category
Silicone watch bands show lower concern compared to rubber or polyurethane straps, which can off-gas volatile organics or degrade into tacky residue on skin. Metal or ceramic alternatives avoid organics entirely but are less comfortable for all-day wear. COROS silicone is typical for consumer sports watches; no performance advantage or disadvantage versus comparable bands from Garmin, Apple, or Fitbit in terms of chemical safety.
If you buy it
Rinse with fresh water after saltwater or heavy sweat to prevent mineral buildup and keep the band supple. Avoid prolonged heat above 60 degrees Celsius (silicone remains stable, but adhesives at the band-connector joint may weaken). Replace if visible cracks, brittleness, or staining develops; silicone can degrade into microparticles when heavily worn but this typically takes years of daily use. Store in a cool, dry place between wear to extend elasticity.
What we don’t know
- Basis
- Model estimate, 62% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Coros has made none
Formulations change between production runs, so check the current label. How we grade.
More water-resistant smart rings & bands 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.