Withings · Water-Resistant Smart Rings & Bands
Compatible For Withings Smartwatch Bands, Lamshaw 18mm, 20mm Size
Low risk. Silicone bands rarely contain PFAS.
Lamshaw smartwatch bands are typically silicone elastomer with lower PFAS risk. Standard aftermarket bands rarely use fluorochemicals.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Silicone or elastomer band
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Skin irritation or allergic contact dermatitis
Silicone itself is hypoallergenic, but dyes, additives, or residual manufacturing chemicals (curing agents, release agents) can trigger sensitivity in susceptible users. No adverse events reported specifically for Lamshaw bands, but wearers with sensitive skin should monitor for rashes at the band contact zone.
Bacterial or fungal colonization
While silicone resists bacterial growth better than fabric, trapped sweat and poor band cleaning create a warm, moist environment that can harbor microbes. Risk is minimal with regular washing but increases if the band is worn 24/7 without drying periods.
Degradation or microplastic shedding
Long-term UV exposure or extreme heat can cause silicone bands to become brittle or peel; fragments that shed are not technically microplastics (silicone is not plastic) but repeated exposure to degraded material may occur. This is a durability issue more than an acute chemical hazard.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Heavy metals
No published test results or recalls indicate lead, cadmium, or other heavy metals in Lamshaw silicone bands. Silicone dyes are typically low-toxicity azo or inorganic pigments, but full composition is not disclosed by the manufacturer.
Source, FDA ↗Off-gassing or volatile organic compounds
Cured silicone bands do not typically off-gas odorous or harmful VOCs at room temperature. A strong chemical smell on a new band may indicate residual uncrosslinked oligomers; airing the band for 24 hours before wear should resolve this.
The full breakdown
What it's made of and why it matters
Lamshaw's 18mm and 20mm bands are elastomer or silicone-based watch straps designed as aftermarket replacements for Withings smartwatches. Silicone is a polymer backbone of silicon and oxygen, inert at skin temperatures and chemically stable, making it a standard choice for wearable bands. Unlike thermoplastic or PVC alternatives, silicone does not typically leach plasticizers or break down into microplastics during normal wear against skin.
The brand's record and disclosure
Lamshaw is a generic aftermarket accessories manufacturer with no major product safety recalls or formal certifications on record for watch bands. The parent brand Withings (owned by Nokia Health) has not publicly disclosed material sourcing or PFAS policies for third-party band compatibility. Neither company publishes full chemical composition data or independent test results for elastomer safety, which is standard opacity in the accessory market.
How it compares in its category
Silicone bands are lower concern wearable band materials because they are non-porous, non-toxic, and resist bacterial growth better than fabric or leather. Most name-brand smartwatch manufacturers (Apple, Fitbit, Samsung) use silicone as their primary band material without reported dermal issues or chemical concerns. Lamshaw's compatibility design mirrors OEM specifications, so fit and material composition are typical for the category rather than a cost-corner reduction.
If you buy it
Wash the band weekly with mild soap and water to prevent sweat and bacteria buildup; silicone is dishwasher-safe but heat above 80°C is unnecessary. Inspect for visible cracks, discoloration, or sticky residue annually; silicone can degrade under prolonged UV exposure or extreme temperature swings. Replace if the band loses elasticity, develops odor, or shows surface peeling. Store bands away from direct sunlight and heat sources (not in hot cars or near radiators).
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
- Withings 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.