Coros · Water-Resistant Smart Rings & Bands
Coros Apex Silicone Breathable Pin & Tuck
Silicone material has lower concern, with no PFAS disclosure from the brand.
Silicone is not a material linked to PFAS. The brand has no PFAS statement on record for this product.
The better-graded swap
Amazfit
Amazfit Helio Smart Ring Health Tracker, No Subscription, Monitors Sleep, Heart Rate & Stress, Titanium Alloy, Water-Res
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, breathable pin and tuck construction
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Coros Apex Silicone Breathable Pin & Tuck is made of, ingredients and materials
This product is constructed from silicone elastomer with a breathable pin-and-tuck weave design. Silicone is a synthetic polymer (Si-O backbone) fundamentally different from organic plastics and textiles, which means it does not typically leach BPA, phthalates, or azo dyes. The breathability feature likely involves strategic placement of silicone rather than chemical additives, making it chemically simpler than coated or treated fabrics.
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.
Silicone thermal degradation and leachates
While food-grade silicone is well-studied for safety, apparel-grade silicone composition and thermal limits are less transparent. Prolonged heat exposure or manufacturing processes could theoretically release oligomeric siloxanes, but no recalled or confirmed risk has been identified for this product.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Formaldehyde / VOCs
Silicone does not require formaldehyde-based finishing treatments or wrinkle-resistant resins typical of cotton or polyester blends. No evidence of formaldehyde exposure risk in silicone apparel of this type.
Source, ATSDR ↗Azo dyes
Silicone apparel does not rely on synthetic azo dyes for color; however, the specific dye sourcing and quality control for this product are not publicly disclosed. Coros has not confirmed use of restricted azo dye standards.
Antimony in polyester
This product is silicone-based, not polyester, so antimony catalyst contamination is not applicable. Antimony hazard is eliminated by material choice.
Flame retardants
Silicone has inherent flame resistance due to its Si-O backbone; additional flame retardant additives are unlikely to be needed and are not documented for this apparel. No flame retardant hazard is anticipated.
Source, EPA ↗The full breakdown
The brand's record and disclosure
Coros is a sports-tech company best known for GPS watches and fitness devices; detailed material safety disclosure or independent certifications for apparel are not publicly documented. The brand has not issued public statements on chemical hazards, supply chain vetting, or restricted substance lists for this garment line. No recalls or safety controversies involving this specific product have been identified in available sources.
How it compares in its category
Silicone apparel is uncommon compared to standard polyester, nylon, or cotton blends, which means direct market benchmarks are limited. Typical synthetic athletic wear carries higher risk for formaldehyde finishes, azo dyes, and antimony in polyester; silicone sidesteps these pathways. The tradeoff is that silicone durability, long-term degradation behavior, and end-of-life environmental impact are less studied than conventional textiles.
If you buy it
Wash in cool water and avoid high heat (dryers, direct heat sources) to preserve silicone elasticity and prevent any potential thermal degradation. Store away from prolonged sunlight and ozone exposure, as silicone can degrade under UV and oxidative stress. Replace if the material becomes sticky, develops odor, or loses breathability, as these may signal breakdown. Standard laundering without aggressive bleach or solvents is sufficient.
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.