Withings · Waterproof Smart Rings & Bands
Withings Smart Ring Vital Signs Monitoring Ring IOS And Android. Sizes 7,8,9,10,11,12,13 - New
Unknown water-resistant coating composition; limited public PFAS data available.
Withings does not disclose PFAS status or coating details for this smart ring. Waterproof electronics often use fluorinated compounds, but no confirmation found for this model.
The safe swap
Fitbit
Oura - Ring 5 - Smart Ring - Size Before You Buy with OR5 Sizing Kit - Size 11 - Silver - (2026)
85/100 safety
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Titanium alloy body with water-resistant coating, unspecified composition
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Waterproof / stain-resistant treatment
water-repellent coating treatments have historically used PFAS.
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 Smart Ring uses a titanium alloy body, which is biocompatible and non-reactive with skin under normal wear. The water-resistant coating composition is not publicly specified by Withings, making it impossible to confirm absence of PFAS or other Teflon-family coating. Titanium alloy itself does not leach toxic metals at body temperature, and the device does not contact food or water intended for ingestion, limiting exposure pathways for coating components.
The brand's record and disclosure
Withings has not published material safety data sheets or coating composition details for this ring. The company has no documented history of product recalls related to chemical contamination or coating degradation in its wearable line. Withings is owned by Nokia Health and maintains certification compliance for wireless devices (FCC, CE) but does not actively market chemical safety transparency as a brand differentiator.
How it compares in its category
Smart rings are a newer category with minimal regulatory oversight for material disclosure compared to cookware or cosmetics. Most competitors (Oura, Samsung Galaxy Ring) similarly do not disclose water-resistant coating formulations. Titanium alloy is a premium choice that avoids nickel-sensitive skin reactions seen in stainless steel rings, giving Withings an advantage in biocompatibility.
If you buy it
Wear the ring continuously as designed; it is rated water-resistant to 5 ATM (shower/swim-safe). Do not expose to saunas or extended hot water (above 60°C) as thermal stress could degrade the coating over time. Clean with mild soap and water weekly. Replace if visible coating chips or discoloration occur, though this is not documented as a common failure mode. Users with nickel sensitivity should confirm titanium alloy content, though allergic reactions to the ring itself are not reported.
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.”
Water-resistant coating composition unknown
Withings does not publicly disclose whether the coating contains PFAS, Teflon-family coating, or other synthetic water repellents. Contact duration with skin is continuous but coating migration into skin is unlikely under normal wear; ingestion risk is near zero.
Titanium alloy nickel content
Titanium alloys can contain trace nickel (typically <0.5% in medical-grade formulations). No recalls or adverse events are recorded for the Withings ring, and nickel sensitivity is rare among titanium alloy wearers compared to stainless steel.
Coating degradation over time
Extended exposure to heat, sweat, or chlorine may degrade the water-resistant coating, potentially exposing the underlying alloy or releasing microparticles. Long-term wear durability data beyond the manufacturer's warranty period is not publicly available.
Skin irritation from continuous contact
No documented reports of dermatitis or allergic reactions specific to the Withings ring. Titanium alloy is hypoallergenic, but individuals with sensitive skin should monitor for irritation at the contact site, particularly under the band where moisture can accumulate.
Heavy metals in alloy matrix
Titanium alloy used in medical devices is regulated and typically free of lead and cadmium. Withings does not specify exact alloy composition (e.g., Ti-6Al-4V vs. other grades), but no adverse events suggest contamination is not a realistic concern.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 35% 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.
Safer alternatives in Waterproof Smart Rings & Bands
Fitbit
Oura - Ring 5 - Smart Ring - Size Before You Buy with OR5 Sizing Kit - Size 11 - Silver - (2026)
Titanium and stainless steel with glass sensor
Lower concern smart ring; no PFAS-prone materials identified.
⚠Brand says nothing about PFAS
Fitbit
Qalo QRNT Slim Smart Ring
silicone elastomer with metal core
Smart ring with silicone body; lower concern but no public PFAS disclosure.
⚠Brand says nothing about PFAS
Withings
Black Smart Ring Size 9 - New Women | Color: Black
Titanium alloy ring with sapphire crystal display
Lower concern. Smart ring materials inherently unlikely to require PFAS.
⚠Brand says nothing about PFAS
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.