Oura Smart Ring 4 Sizing Kit | Non-Standard Fit - Size Before You Buy - Measure For Best Comfort and Accuracy - Receive Credi
Reviewed 23 August 2026 · price checked live
Check price on Amazon →Overview
OURA Smart Ring 4 Sizing Kit | Non-Standard is one of the 43 wearable technology products in our catalogue, tracked on rating, review volume and live price. The maker describes it as follows: The Oura Ring 4 Sizing Kit is the ideal way to find the perfect size. It’s a custom sizer that allows for you, and those around you, to find the perfect fit before purchasing. With a sizing kit purchase, receive a dh35.00 Amazon credit towards the future purchase of an Oura Ring 4. Sizing kit is not returnable (terms and conditions apply). Those are the seller's own claims rather than our testing, so treat them as a starting point. On Amazon it holds 4.5 out of 5 from 1,321 ratings. What that score is worth next to its rivals is set out below.
- Brand
- OURA
- Amazon rating
- 4.5 / 5 from 1,321 ratings
- vs Wearable Technology
- 0.1 above the category median of 4.4
- Rank in category
- 11 of 43 rated wearable technology we track
- Price position
- Among the cheaper options (category spans £3.90 to £299)
- How proven
- Moderate review volume
How it compares in Wearable Technology
Across the 43 rated wearable technology products we track, the typical score is 4.4 out of 5. This one sits at 4.5, which is around the middle of the category. Ratings alone will not separate it from its rivals here, so price and the specifics below matter more than the star count.
It carries 1,321 ratings against a category median of 3,064. That is enough of a base to take the score seriously without treating it as settled.
On price it sits in the lower third of a category running from £3.90 to £299, where the midpoint is about £6.99. Cheaper than most while rating at or above the category norm is the combination worth looking for, and it is the main argument for this one.
Worked out from the 43 wearable technology products in our catalogue, not from the brand's own claims. How we rank →
Key features
- OURA RING 4 SIZING KIT - The Oura Ring 4 Sizing Kit is the ideal way to find the perfect size. It’s a custom sizer that allows for you, and those around you, to find the perfect fit before purchasing.
- RECEIVE dh35.00 CREDIT - With a sizing kit purchase, receive a dh35.00 Amazon credit towards the future purchase of an Oura Ring 4. Sizing kit is not returnable (terms and conditions apply).
- NOT STANDARD SIZING - Oura Ring 4 sizes are slightly different from standard ring sizes, so it is important to size yourself using our Oura Ring 4 sizing kit and to follow the instructions provided. Oura Ring 4 is available in sizes 4-15. There are no half sizes.
- COMFORT AND ACCURACY - A properly fitting Oura Ring will result in the highest data accuracy, comfort, and overall experience.
- CHOOSE A FINGER - Oura Ring 4 works on all fingers and can be worn on either hand. For optimal accuracy, we recommend wearing your Oura Ring 4 on your index, middle, or ring finger. Size the exact finger you plan to wear your Oura Ring 4 on.
