Find Your Perfect Fit
A secure and comfortable fit helps your Stellar Ring maintain consistent skin contact and provide more reliable measurements throughout the day and night.
How to Find Your Size
For the most accurate fit, use the official XATRIX sizing kit before confirming your final ring size.
01
Try the Sizing Ring
Choose a size that sits securely against your skin without pinching or causing discomfort.
02
Choose the Finger
The index finger is recommended. The middle or ring finger can also work when the fit remains stable.
03
Wear It for 24 Hours
Test the fit during the day, while sleeping, and after activity, since finger size naturally changes.
04
Confirm the Fit
The ring should not rotate freely and should come off with slight resistance.
A Good Fit
✓
Sits firmly against the skin
✓
Does not rotate freely
✓
Has no obvious gap when making a fist
✓
Can be removed with slight resistance
✓
Remains comfortable while sleeping
Between Two Sizes?
✓
Choose the smaller size if it remains comfortable
✓
Choose the larger size if the smaller one feels restrictive
✓
Test both sizes overnight
✓
Try another recommended finger
✓
Prioritize stable skin contact over a loose fit
Sensor Position
Wear the ring with the sensor area positioned on the palm side of your finger. Correct placement helps maintain stable skin contact and supports more consistent measurements.
US Size Chart
Stellar Ring is available in full US sizes 6–13.
| US Size | Inner Diameter |
|---|---|
| US 6 | 16.9 mm |
| US 7 | 17.7 mm |
| US 8 | 18.4 mm |
| US 9 | 19.3 mm |
| US 10 | 20.1 mm |
| US 11 | 20.9 mm |
| US 12 | 21.9 mm |
| US 13 | 22.7 mm |
Frequently Asked Questions
Can I use my normal jewelry ring size?
You can use it as a starting point, but smart-ring dimensions and internal sensor components may affect the fit. The official sizing kit remains the most reliable method.
Which finger gives the best measurements?
The index finger is recommended. The middle and ring fingers are also suitable when the ring maintains secure and consistent skin contact.
How tight should the ring feel?
Secure, but never painful. It should not spin freely, leave a visible gap, cause numbness, or become difficult to remove.
Why should I test the size overnight?
Finger size can increase during sleep, warm weather, exercise, and changes in hydration. Overnight testing helps confirm that the fit remains comfortable.