Oura Ring is crafted with titanium and has a seamless inner molding (for comfort). Due to the plastic used to make the ring sizers, they may seem less comfortable than the actual Oura Ring.


Usage

The Oura Ring works on all fingers and can be worn on either hand. 

For optimal performance and accuracy, it's recommended to wear your Oura Ring on your index finger. 

If you prefer another finger, the middle or ring fingers are the next best option, but try to avoid fingers with large knuckles (where the base of your finger is narrower than the knuckle).

The sensor bumps inside the ring sizer should be on the pad (palm side) of your finger.

Keep in mind, these mimic the LED sensors located inside the Oura Ring, which are used to detect and track your body signals. Without proper ring orientation, Oura won't be able to share accurate data with you.

Your Oura Ring should fit tightly and securely around the base of your finger, but not to the point where it's uncomfortable.

Test the fit by making a fist while wearing your ring sizer. If you see a gap between the top of your finger and the inside of the ring, you might need a smaller size.

Your fingers expand and contract based on environmental factors, so it's recommended to wear your ring sizer for at least 24 hours to confirm your best fit. Your ring should not rotate as you go about normal daily tasks.

Your fingers may be slightly larger in the morning, which is why wearing it overnight is a great gauge to start with.