Fitbit · Water-Resistant Smart Rings & Bands
WITHit Fitbit Versa 3 & Fitbit Sense Silicone Band
Silicone bands carry low PFAS risk, but no brand disclosure available.
Silicone is an inherently lower-concern elastomer unlikely to contain PFAS. Fitbit provides no specific PFAS statement for this band.
The better-graded swap
Bluetooth Ring 3.0 Pack Smart Digital Weight Control
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 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.
Skin contact sensitization or irritant dermatitis
Individual sensitivity to silicone or residual manufacturing compounds is rare but documented in case reports. Risk is low for Fitbit bands broadly, but some users report mild rash or itching with prolonged wear; this usually resolves with band rotation and cleaning.
Bacterial or fungal growth on band surface
Any wearable band, including silicone, can harbor moisture and microbes if not dried after sweat or washing. This is a hygiene concern, not a material hazard; regular washing and air drying mitigate risk.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Silicone additive leaching
Medical-grade and food-contact silicone leach minimally under normal skin contact. This band is not food-contact, and no leaching of oligomers or processing aids has been reported for WITHit or mainstream smartwatch bands.
Heavy metals
Silicone bands typically use organic dyes or inorganic pigments (iron oxide, titanium dioxide) that do not leach onto skin in detectable amounts. No metal contamination recalls exist for WITHit or Fitbit silicone bands.
Source, FDA ↗Formaldehyde / VOCs
Silicone elastomers do not release formaldehyde as a byproduct of curing or aging. Off-gassing of VOCs is not a recognized issue for silicone bands worn on wrist.
Source, ATSDR ↗The full breakdown
What it's made of and why it matters
This WITHit band is a silicone elastomer designed to replace or supplement the factory Fitbit band on Versa 3 and Sense smartwatches. Silicone is a synthetic rubber polymer with a stable Si-O backbone that resists leaching of additives into skin under normal wear conditions. Unlike PVC or certain plastics, silicone does not typically contain phthalates or BPA, making it a relatively inert material choice for wearable bands. The band's role is purely mechanical and contact-based, so chemical transfer risk is lower than with food-contact silicone.
The brand's record and disclosure
WITHit is a third-party accessory maker with no widely published chemical or sustainability certifications on record. Fitbit (owned by Google since 2021) has not issued specific material disclosures for this band. No major recalls, lawsuits, or safety warnings have been publicly documented for WITHit Fitbit bands. The brand maintains a functional reputation for fitment and durability but does not market safety testing or material certifications.
How it compares in its category
Replacement smartwatch bands in this price tier (typically ten to thirty dollars) rarely undergo third-party chemical testing; WITHit sits at the mainstream standard. Original Fitbit silicone bands carry equivalent material chemistry and lack formal disclosure as well. Premium alternatives (e.g., leather, stainless steel) avoid polymer hazards entirely but cost more. Generic silicone bands from unbranded sellers carry identical material safety profiles but higher variability in manufacturing controls.
If you buy it
Wash the band in warm soapy water before first use to remove any manufacturing residue. Check the band weekly for visible tears, cracks, or discoloration that could signal degradation. Avoid sustained exposure to direct sunlight or heat above 60°C (140°F), as silicone can soften and lose shape. Replace if you notice skin irritation or persistent odor, though this is uncommon; rotate bands if wearing the same one for 8+ hours daily to reduce skin maceration risk.
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
- 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.