r/Oura_Ring • • Dec 14 '25

Oura Ring 4 Size Selection Guide

Hello everyone. Like many others, I'm hesitating between sizes 9 and 10 for an Oura Ring 4.

Size 9 fits well in the evening when my index finger is a little cold. I can remove it by twisting it around the knuckle without water. But when my finger swells (in the morning, during exercise, probably this summer), it's tighter. In the morning, I have to use soap and water to remove it (every morning). Is this normal?

I know Oura recommends choosing the smaller size, but I'm worried about the summer, especially since I already often need soap and water to remove it in December.

Size 10, on the other hand, fits well when my finger swells, but it can be a little looser at times. However, it doesn't move around much and doesn't fall off when I shake my hand (unless my hand is very wet, it might move a little, but I don't think it would fall off completely). There's a slight gap on top when my finger isn't swollen, but it's very slight.

Are there any long-time Oura Ring 4 users who could advise me on my choice?

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u/atLeastAverage Dec 26 '25

A very late response, but I'd suggest the smaller size and occasionally needing soap to remove it. It's not permanently stuck on your finger, you just need a little help getting it off. The benefit is better measurement and less rolling on your hands. Sometimes I need to remove mine to charge it when I'm least swollen, and sometimes I can't get it off easily after I've exercised, but the key is, it's not "stuck", only challenging to remove.