Oura - Ring 5 Sizing Kit - Size Before You Buy the OR5 - Unique Sizing - Receive Gift Card for Purchase - White - (2026)

Upgraded to this generation after having a 4th gen. I love Oura and the health insights that I get from the device. I love the activity tracking and sleep data, which are mainly what I use it for. I did labs through Oura which were quick and easy as well. As far as the difference between the 4 and 5, I haven’t noticed any other than the size is significantly smaller - which is nice! Battery lasts days. I have swam in the ocean, pools, bathed, washed hands with it on and have had no problems.

The Oura Ring 5 is here, and this is simply the sizing kit Oura recommends. There is not much to say besides that you will receive a $10 gift card with the purchase, which makes this kit free (without taxes). These rings are made of plastic, and there are 8 different sizes. I tried mine out for a little over a day on my least dominant hand before (Oura recommends a day) deciding on a ring size. I recommend choosing a ring that fits snug but not completely tight. Also, consider selecting a ring that fits at least two of your fingers. This is so you can continue wearing your ring in case one of them gets bruised or you get a cut on it. I found a ring that fits both my index and middle fingers. I tried the plastic ring on both fingers and went through various day-to-day tasks and exercises. Some of these items include jogging, strength training, carrying groceries, cleaning, lawn maintenance, etc. I simply wanted to test out how some of my daily activities feel with this Oura ring on. Something I did notice was that the ring is small enough that it doesn't get in the way of most things unless you are gripping something strongly, like a barbell. That’s when the discomfort starts to set in. But overall, the plastic ring feels mostly comfortable! The sizing kit also comes in a convenient box. After you are done using the kit, the box can be given to an interested family member or friend. Overall, a great and straightforward sizing kit for the Oura Ring 5!

Bottom Line: The Oura Ring sizing kit provides 8 different sizes that perfectly match the actual product. Pros: Perfectly matches the actual Oura Ring 5 Cons: no half sizes; likely doesn't match real ring sizes Full Review: The Oura Ring 5 Sizing Kit comes with 8 different ring sizes (6-13), which perfectly match the actual product. This is important because the Oura Ring has small sensor bumps, and the sizing ring will help you get a feel for how the ring and those sensors fit on your finger. The instructions also recommend that users wear the sizing ring for 24 hours, since fingers tend to swell and relax throughout the day. This isn't an issue with the sizing kit per se, but Oura does not make half sizes. My finger fit snugly into the size 10, but the size 11 felt more comfortable. I checked Oura's website, and they recommend that people opt for the smaller size if between sizes. However, I was worried about comfort for a ring that I was going to wear continuously throughout the day, and so I opted to order the larger size. For me, that ended up being the right decision because the larger size is, indeed, more comfortable, and I've no issues with the sensor readings. Last, although the sizing kit perfectly matches the actual Oura Ring 5, I don't know how well the Oura Ring 5 matches actual ring sizes.

This sizing kit was really great! It gives you a variety of sizes to try on for the 24 hours that it requires. I really like the comfort of the sizing rings. And I was surprised on how accurate the sizing is to the actual ring. I would definitely recommend this to anyone who is going to get an oura ring and doesn’t know what size they should get.

It's a great concept considering the sizing is different than regular ring size. By wearing the sizing kit, I was able to try out different sizes for various lengths of time to get a true idea of the feel.