Fitbit · Water-Resistant Smart Rings & Bands
Fitbit Infinity Band
No coating described, and no PFAS statement from the brand.
The product information we reviewed describes elastomer/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
Elastomer/silicone band
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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 degradation and particulate shedding
Silicone bands can degrade over extended use (12-24+ months), especially with UV exposure or alkaline sweat environments, potentially releasing fine elastomer particles. This is a slow process and not a documented recall driver for Fitbit, but long-term wearers should inspect the band for visible wear.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Contact dermatitis or skin sensitivity
Silicone is hypoallergenic and latex-free, making true allergic reactions rare. However, trapped sweat, poor cleaning, or individual sensitivities to residual manufacturing additives (colorants, cure catalysts) could trigger mild irritation; no Fitbit-specific incidents have been documented.
Heavy metals
Fitbit has not disclosed pigment sourcing or heavy metal testing. Silicone bands typically use iron oxides or organic dyes rather than cadmium or lead-based colorants, but without third-party testing, the risk cannot be fully ruled out in budget production batches.
Source, FDA ↗Residual uncrosslinked oligomers leaching from silicone
Poorly cured silicone can leach low-molecular-weight oligomers that may cause skin irritation or taste oddness if the band contacts the mouth. This is a quality-control marker; Fitbit's brand reputation suggests minimal risk, but no toxicology studies on Infinity Band leachate have been published.
Water intrusion and bacterial growth in device seams
The band itself is resistant to water, but the junction between the band and the watch face or electronics can harbor bacteria and mold if not dried thoroughly after immersion. This is a maintenance issue rather than a material hazard.
The full breakdown
What it's made of and why it matters
The Fitbit Infinity Band is constructed from elastomer/silicone, a synthetic rubber polymer chosen for flexibility, water resistance, and skin contact safety. Silicone does not leach BPA, phthalates, or other endocrine disruptors under normal wear conditions, and its chemical stability means it resists degradation from sweat, water, and body heat during extended use. The band's durability and non-porous surface make it easier to clean than fabric alternatives and reduce microbial colonization risk.
The brand's record and disclosure
Fitbit (owned by Google since 2021) has not published detailed material safety data sheets or independent third-party certifications for band composition. No public recalls or safety complaints specifically tied to the Infinity Band material have been documented. The brand's silence on PFAS and other chemical additives is consistent with wearable industry practice but limits transparency; Fitbit does not market materials as PFAS-free or tested.
How it compares in its category
Silicone bands are the industry standard for smart rings and fitness trackers, and silicone itself carries a stronger safety profile than fabric or coated polymer alternatives that may shed microfibers or off-gas VOCs. Compared to fabric straps, silicone avoids dye-related hazards (azo dyes, formaldehyde finishes). Unlike some budget wearables, Fitbit's manufacturing footprint and QA reputation suggest lower risk of uncontrolled material additives, though formal certification is absent.
If you buy it
Rinse the band with fresh water after exposure to chlorinated pools or salt water to extend life and reduce buildup of irritants. Inspect the band monthly for cracks, peeling, or discoloration; silicone can degrade over 1-3 years depending on sun exposure and sweat chemistry, and early replacement prevents skin contact with exposed substrates. Avoid prolonged direct sunlight storage and do not expose to temperatures above 60C (140F). If skin irritation develops, discontinue use and allow skin to dry fully before reinserting.
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
- Fitbit 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.