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.

However, you don't actually need to shell out 10 smackeroos to size up your finger. I'll touch on that, as well as how to properly test the dummy rings, below.

How to use the Oura Ring sizing kit • Purchase your sizing kit (and collect your rebate) • Choose your finger • Try different sizes until you find one that’s snug yet comfy • Wear the ring for at least

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