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

I wore this ring sizer for about a week before I decided on a size. I was actually the first couple days so aggravated because I couldn’t decide between a size. I swell in the morning, fluid is my worst enemy, and in the morning the ring would be stuck or to loose Took me about a week to actually find the perfect size and the perfect finger to see which one it’s going permanently on. But I am really glad that they did the 10$ towards the ring when u do purchase it because other wise I’d feel like I would just be highly upset or would have ticked myself off if I bought the ring and never did the sizing because I didn’t wanna spend the extra 10$ but I knew for a fact I was buying on anyways so it helped. I would highly recommend buying this before purchasing the actual ring and u find out that your normal ring size isn’t true to size with ours and u waste money!

The sizing kit was really helpful before ordering the Oura Ring 5. The rings were easy to try on, and I liked being able to wear a size for a while instead of guessing based on my normal ring size. Since the Oura sizing is different from a standard ring, I definitely recommend using the kit first. Simple process and gave me more confidence that I was ordering the right size. I do wish that Oura did have 1/2 sizes.

Great little ring to track biometric data. This is just the sizing guide but they keep it easy, you get the money back for this when buying the ring and I highly recommend the ring

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.

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.