Withings · Waterproof Smart Rings & Bands
Withings Smart Ring For Women - New Women
Waterproofing likely uses fluorinated coatings; insufficient brand transparency.
Smart rings require water resistance, typically achieved with fluorinated surface treatments. Withings provides no PFAS information; coating composition unstated. Limited data for confident assessment.
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, unspecified waterproof coating/sealant
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 inherently corrosion-resistant and biocompatible for prolonged skin contact. Titanium alloys do not leach nickel or other heavy metals under normal wear conditions. However, the waterproof coating and internal sealants are not specified by Withings; these are typically Teflon-family coating-based in consumer electronics, creating PFAS exposure potential. The unspecified adhesives and conformal coatings inside the device also remain undisclosed.
The brand's record and disclosure
Withings does not publicly disclose material safety data, chemical composition of coatings, or PFAS use statements for the Smart Ring. The company has no published independent certifications (such as STANDARD 100 by OEKO-TEX or similar material audits) for this wearable. No recalls or adverse skin reaction incidents have been widely reported for this specific model, but the brand's silence on waterproofing chemistry is notable given regulatory scrutiny of PFAS in consumer wearables.
How it compares in its category
Smart rings as a category rarely disclose coating materials; Withings' transparency gap is typical rather than exceptional. Competitors like Oura Ring and Samsung Galaxy Ring also do not publicly specify their waterproof formulations. Titanium body choice is a material-selection strength and aligns with premium positioning, though it does not eliminate PFAS risk in seals and coatings that are standard across the category.
If you buy it
Rinse the device regularly under fresh water after swimming or sweating to minimize any leachable residue accumulation. Avoid prolonged contact with chlorine pools, as this can degrade surface coatings over time. Do not attempt to open or disassemble the device, as this breaches the waterproof seal. Replace the device within the manufacturer's battery life window (typically 4-7 days per charge) or if the seal shows visible cracks or coating peeling.
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.”
Teflon-family coating/PFAS in waterproof coating and sealant
Wearable electronics almost universally use fluorinated coatings for water resistance. Withings has not disclosed the specific chemistry; risk is bioaccumulative and migrates slowly into skin oil films during daily wear.
Adhesive off-gassing (VOCs/formaldehyde releasers)
Epoxy or polyurethane adhesives used in ring assembly may release volatile organics in early use. Not reported as an issue for this model, but standard for electronics; risk is minimal given small product size and brief off-gas window.
Nickel or cobalt from titanium alloy impurities
Medical-grade titanium alloys used in wearables are typically nickel-free or contain trace levels below 0.05%. No skin sensitization incidents reported for Withings Smart Ring; biocompatibility data is not published but alloy choice suggests due diligence.
Coating degradation and microparticle shedding
Repeated flexing, saltwater exposure, or abrasion can cause Teflon-family coating and protective coatings to crack and shed microscopic particles. No reports specific to this model, but long-term wear durability (beyond 2 years) is undocumented by the brand.
Unspecified conformal coating or potting compounds inside device
Internal electronics are sealed with adhesives or potting resins of undisclosed composition. These are not in direct skin contact but could contribute to overall PFAS or volatile organic compound profile if the device is damaged.
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.