How to Choose the Right Size for Your Luna Ring

Quick Answer:
The Luna  Ring should fit snugly without squeezing. It should not rotate easily on your finger, but it should feel comfortable enough to wear all day and while sleeping. If you are between sizes, sizing up is usually best.

Why Smart Ring Sizing Is So Important

Unlike traditional jewelry, smart rings rely on consistent contact with your skin to deliver accurate health insights. A properly fitted Luna Ring ensures reliable tracking of sleep, heart rate, recovery, and daily activity.

If a ring is too loose, sensors may lose contact. If it’s too tight, it can become uncomfortable — especially overnight. The right fit balances accuracy and comfort.

How the Luna Ring Is Designed to Fit

Luna Smart Rings are designed specifically for 24/7 wear. Each ring features a comfort-fit interior with smooth, rounded edges that reduce pressure points on the finger.

• Lightweight construction for all-day comfort
• Rounded inner profile to prevent irritation
• Secure fit without feeling restrictive

Many users report that Luna feels more comfortable than traditional rings — even during sleep.

Which Finger Should You Wear the Luna Ring On?

For the most accurate and consistent tracking, Luna recommends wearing the ring on:

• Index finger (best overall accuracy)
• Middle finger (great alternative)
• Ring finger (acceptable if others feel uncomfortable)