They say size doesn't matter, but when it comes to smart rings, too small or too large can lead to discomfort and/or unreliable health data. The best way to ensure perfect sizing for your smart ring is by using a sizing kit.
As such, the Oura Ring 4, the best smart ring available today, only performs at its best when properly sized to your finger, which is why the brand offers a sizing kit with plastic dummy rings for $10.
