Size Guide

Ultra Human Ring Size Guide

Choosing the right ring size is essential for accurate tracking and all-day comfort.

How to measure your ring size:
1. Wrap a non-elastic string or strip of paper snugly around the base of your finger.
2. Mark where the ends meet.
3. Measure the length in millimeters.
4. Match the measurement with our size chart on the product page.

Tips for best fit:
• Measure your finger at the end of the day
• Avoid measuring when your hands are cold
• The ring should feel snug but comfortable
• If between sizes, choose the smaller size for better sensor accuracy

If you need help selecting your size, contact our support team before placing your order.