Coros · Water-Resistant Smart Rings & Bands
COROS Silicone Watch Band - Unisex Replacement Strap For Smartwatch teal-blue / 22mm
Lower concern. Silicone rarely contains PFAS, but verify material origin.
Silicone watch bands are generally lower PFAS risk compared to treated textiles. Coros makes no public PFAS disclosures.
The better-graded swap
Smart Ring 3 Standard with 1 Charging Case
85/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Silicone elastomer strap
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
You may also be interested in
Top-graded picks in the categories readers replace first, every one scored on the same rubric.
Aqua Pure
3M Aqua-Pure AP802B Whole House Filter Housing
- polypropylene filter housing, carbon/sediment cartridge
- We found no PFAS statement from the brand
- Bacterial growth in spent cartridges
3 hazards checked on this product. See all of them.
Aquasure
Premier Series 75 GPD Under Sink Reverse Osmosis Water Filtration System
- RO membrane, carbon filters, stainless steel housing
- We found no PFAS statement from the brand
- Bacterial and microbial growth in housing and filters
4 hazards checked on this product. See all of them.
Avocado
Vegan Mattress
- organic cotton, natural latex, coconut coir, recycled steel coils
- The brand calls it PFAS-free, which we have not verified
- Heavy metals
2 hazards checked on this product. See all of them.
What COROS Silicone Watch Band - Unisex is made of, ingredients and materials
This is a silicone elastomer strap, a synthetic rubber polymer that is chemically inert and does not readily leach into skin or sweat. Silicone is one of the most stable elastomers used in wearables and personal care because it resists temperature cycling, UV exposure, and moisture without degrading into harmful byproducts. The teal-blue color is achieved through pigment additives, but silicone's closed polymer structure minimizes migration of colorants. No Teflon-type coating or coatings are involved, eliminating fume or degradation pathways common in other watch band materials.
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.
Bacterial or fungal growth
Silicone is non-porous and naturally antimicrobial, but sweat and dead skin cells can accumulate in the watch-band junction. Risk is avoidable with regular cleaning and is not specific to this brand.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Colorant migration or dye leaching
Silicone's dense polymer matrix resists pigment migration to skin or sweat. No reports of color transfer or skin irritation from COROS silicone bands; standard risk for any pigmented elastomer is low.
Skin sensitization or contact dermatitis
Silicone is hypoallergenic and approved for medical implants. Reaction is rare, but possible in individuals with fragrance sensitivity if the band was treated with additives not listed; COROS does not disclose processing agents.
Material degradation or microplastic shedding
High-quality silicone does not degrade into microplastics under normal wrist wear. Risk increases only if the strap is exposed to extreme heat, UV, or mechanical stress; standard use poses negligible risk.
Heavy metals
Teal-blue pigments in consumer-grade silicone are regulated and cadmium/lead use is prohibited in most markets. No testing data published by COROS, but no recalls or complaints suggest a problem.
Source, FDA ↗The full breakdown
The brand's record and disclosure
COROS is a sports watch manufacturer with no public record of safety recalls or material disclosures for their silicone straps. The brand does not publish detailed chemical specifications or third-party certifications for replacement bands. This silence is typical for the wearables category and does not indicate a safety problem; it reflects an industry norm of minimal transparency on elastomer sourcing. No contamination incidents or complaints about COROS silicone bands have surfaced in available consumer or regulatory records.
How it compares in its category
Silicone watch straps present lower concern than fabric, leather, or metal alternatives because they do not require dyes, tannins, nickel plating, or formaldehyde-based finishes. Compared to rubber or polyurethane bands, silicone resists bacterial growth better due to its non-porous surface and is less prone to off-gassing. Silicone straps are also more durable and do not degrade into microplastics the way lower-grade elastomers can; they are a standard choice in medical wearables for this reason.
If you buy it
Clean the strap regularly with mild soap and water to prevent sweat buildup and reduce skin irritation risk in sensitive individuals. Avoid prolonged exposure to direct sunlight or heat above 60 degrees Celsius, though standard silicone is stable well beyond typical wrist temperatures. Replace the band if you notice discoloration, cracking, or loss of elasticity, but this is cosmetic rather than a safety trigger. Store the strap in a cool, dry place when not in use to extend its lifespan.
What we don’t know
- Basis
- Model estimate, 72% 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.