Oura - Ring 5 - Smart Ring - Size Before You Buy with OR5 Sizing Kit - Size 11 - Silver - (2026) vs RingConn Gen 2 Air Ultra-Thin Smart Ring: which is safer?
RingConn Gen 2 Air Ultra-Thin Smart Ring is our pick: better on PFAS and on the overall hazard picture.
Fitbit
Oura - Ring 5 - Smart Ring - Size Before You Buy with OR5 Sizing Kit - Size 11 - Silver - (2026)
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleElectronic component off-gassing or thermal breakdown
ReportedBiofilm and bacterial growth on sensor surfaces
PossibleGlass or metal micro-debris from wear
Our pick
Withings
RingConn Gen 2 Air Ultra-Thin Smart Ring
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleNickel leaching from titanium alloy or plating
PossibleCeramic coating integrity loss over time
PossibleSkin occlusion or irritation from continuous wear
Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
More waterproof smart rings & bands: see the full ranking