Withings · Waterproof Smart Rings & Bands
Smart Ring Health Tracker 5atm Waterproof Sport Ring Exclusive
Skip until Withings discloses waterproof coating chemistry
Withings smart rings use waterproof coatings but provide no PFAS disclosure or material transparency. Insufficient public data to assess risk accurately.
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 waterproof sealing coatings, unspecified
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 hypoallergenic for extended skin contact. The critical unknown is the waterproof sealing coating applied to achieve 5 ATM (50m) water resistance. Withings has not publicly disclosed whether this coating contains PFAS compounds (Teflon-family coating like Teflon-type coating), which are common in hydrophobic/oleophobic finishes on wearables. Without this disclosure, the actual chemical exposure profile cannot be fully assessed.
The brand's record and disclosure
Withings (owned by Nokia Health) has not published material safety data sheets, ingredient lists, or statements regarding PFAS use in their wearable devices. The company has not obtained third-party certifications (such as MADE SAFE or similar) that would verify absence of restricted chemicals. This silence on a known hazard class in waterproof wearables represents a transparency gap, especially given that competitors have begun disclosing coating chemistry or committing to PFAS-free alternatives.
How it compares in its category
Smart rings in this price/feature tier typically use similar titanium or stainless steel bodies with proprietary waterproof coatings. Most competitors (Oura, Samsung Galaxy Ring) also lack full public chemical disclosure, making Withings typical rather than exceptional for transparency. However, the absence of any statement from Withings about PFAS avoidance puts it in the less cautious segment of the wearables market, where disclosure is increasingly expected.
If you buy it
Wear the ring continuously as designed; titanium itself poses no known leaching risk from sweat or water exposure during normal use. Avoid exposing the device to sustained heat above 60°C or harsh solvents, as these can degrade sealing coatings and potentially accelerate leaching of coating additives. Request the safety data sheet directly from Withings support before purchase, specifically asking about PFAS content and coating ingredients. If you have sensitive skin or are pregnant, this is a reasonable conversation point with your healthcare provider given the unresolved coating chemistry.
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.”
PFAS in waterproof coatings
Undisclosed sealing chemistry on a water-resistant wearable is a red flag. PFAS-based Teflon-family coating are standard in hydrophobic device coatings; Withings' silence suggests no commitment to PFAS-free alternatives. Chronic dermal contact with trace coating degradation is a theoretical pathway.
Titanium alloy impurities (nickel)
Some titanium alloys contain small amounts of nickel as a strengthening agent. For individuals with nickel dermatitis, prolonged skin contact could trigger localized reactions. Withings has not published alloy specifications, so nickel content is unverified.
Coating degradation and leaching over time
Waterproof coatings on wearables degrade with daily wear, sweat exposure, and abrasion. As the coating breaks down, microparticles and additives (including potential PFAS) may increase in contact with skin. No long-term degradation data is publicly available for this product.
Biofilm and bacterial growth under the ring
Continuous-wear rings can trap moisture and bacteria under the band if not cleaned regularly. While not a direct material hazard, poor hygiene can cause skin irritation or infection, especially in users with compromised skin barriers.
Battery chemical leakage (if damaged)
The ring contains a lithium battery sealed within the body. No documented leakage incidents exist for this model, but severe physical damage could theoretically expose battery electrolyte, which is caustic. Normal use presents negligible risk.
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.