OURA RING 5 SIZING KIT - The Oura Ring 5 Sizing Kit is the ideal way to find the perfect size. It’s a custom sizer that allows for you, and those around you, to find the perfect fit before purchasing SIZE BEFORE YOU BUY - Oura Ring 5 sizes are different from standard ring sizes. Size yourself with the Oura Ring 5 Sizing Kit NON STANDARD SIZING - Oura Ring 5 sizes are slightly different from standard ring sizes and other Oura Ring sizes. It’s important to size yourself using our Oura Ring 5 Sizing Kit. Oura Ring 5 is available in sizes 6-13. There are no half sizes COMFORT AND ACCURACY - A properly fitting Oura Ring 5 will result in the highest data accuracy, comfort, and overall experience CHOOSE A FINGER - Oura Ring 5 works on all fingers and can be worn on either hand. For optimal accuracy, we recommend wearing your Oura Ring 5 on your index, middle, or ring finger. Size the exact finger you plan to wear your Oura Ring 5 on