Optimal Sensor Accuracy

The Oura Ring’s sensors are most effective when the fit is snug and consistent. The sizing kit helps ensure your final ring sits exactly where it should for reliable health insights.

Comfort, All Day and Night

You'll wear your Oura Ring during sleep, workouts, meetings, and everything in between. Try different sizes to find one that fits your lifestyle as much as your finger.

One-Time Fit Guarantee

When you use the Sizing Kit and confirm your fit before ordering the ring, you reduce the chance of needing a size exchange—saving time and hassle.