Withings · Waterproof Smart Rings & Bands
Withings Black Smart Ring Size 9 - New Women | Color: Black
Lower concern. Smart ring materials inherently unlikely to require PFAS.
Withings Smart Ring uses titanium alloy and sapphire crystal, materials not typically treated with PFAS. No PFAS disclosure from brand, but product category poses minimal chemical exposure risk.
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Titanium alloy ring with sapphire crystal display
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
Category baseline
other is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
The Withings Black Smart Ring uses a titanium alloy body with a sapphire crystal display window. Titanium is bioinert and highly resistant to corrosion, meaning it does not leach metals or degrade into the skin under normal wear. Sapphire crystal is synthetic aluminum oxide, chemically stable and non-reactive with skin or bodily fluids. This material pairing is inherently low-risk for chemical exposure compared to polymers or plated metals.
The brand's record and disclosure
Withings is a health-tracking company owned by Nokia and does not publish detailed material safety datasheets or third-party certifications for its wearables. The company maintains no publicly documented stance on restricted substances, heavy metals, or manufacturing standards for the Smart Ring. No product recalls or material safety incidents have been reported for this model to date.
How it compares in its category
Smart rings as a category have minimal chemical hazard profiles compared to other wearables because they involve no heating elements, adhesive patches, or extended skin occlusion typical of smartwatches or fitness trackers. The titanium and sapphire approach is among the most inert material choices available in this segment. Competing rings (Oura, Samsung Galaxy Ring) use similar metal alloys and synthetic crystals with comparable safety profiles.
If you buy it
Clean the ring periodically with mild soap and water to prevent biofilm buildup under the sensor; avoid prolonged exposure to harsh chemicals or abrasive surfaces that could scratch the sapphire. Titanium is durable and unlikely to require replacement due to material degradation. If skin irritation develops, it is more likely related to fit or sensor sensitivity than material composition; discontinue wear and consult a dermatologist if symptoms persist.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Nickel leaching from alloy
Titanium alloys often contain nickel as a strengthening agent. Although titanium itself is hypoallergenic, nickel content varies by supplier. Withings does not disclose the precise alloy composition, so nickel sensitization risk cannot be fully ruled out in individuals with known nickel allergy.
Biofilm and bacterial growth under ring
Wearable rings create a moist microenvironment under the band where bacteria and fungi can accumulate, particularly with poor hygiene. This is a mechanical entrapment issue, not a material hazard, but prolonged wear without cleaning increases risk of skin infection or irritation.
Adhesive or sealant leachables at joints
The sapphire crystal is likely bonded to the titanium housing with adhesive or epoxy resin. If adhesive contains bisphenol compounds or volatile organics, prolonged skin contact could result in low-level exposure, though this remains unconfirmed for this specific product.
Heavy metals in solder or internal components
Internal electronics and sensor components are not disclosed. Assuming standard lead-free solder and RoHS compliance (typical for consumer electronics in EU/US markets), heavy metal risk is low, though unverified by independent testing.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
More waterproof 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.