Oura Ring 4 Sizing Kit - Size Before You Buy - Unique Sizing Classification for Smart Rings - Receive Credit for Purchase

- Find the perfect fit for your Oura Ring 4 with this sizing kit - it includes sizes 4 to 15- Oura ring sizes are a little different from standard ring sizes, so you can try before you buy- A properly fitting ring gives you the best data accuracy and comfort- Oura recommends wearing the sizer for at least 24 hours - it shouldn't rotate when doing activities - Manufacturers part number: 548381