Price: $10.00
(as of Oct 17, 2025 02:14:31 UTC – Details)
The Oura Ring 4 Sizing Kit allows for you and those around you to find the ideal fit before purchasing. With a sizing kit purchase, a 10 credit will automatically be applied to your Oura Ring 4 at checkout. A properly fitting Oura Ring 4 will result in the highest possible data accuracy, comfort, and overall experience. Oura Ring 4 sizes are slightly different from standard ring sizes, so it is important to size yourself using our tools and to follow our sizing instructions. 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.
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
SIZE BEFORE YOU BUY – Oura Ring 4 sizes are different from standard ring sizes. Size yourself with the Oura Ring 4 Sizing Kit. For additional details, see “From the brand” section below
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. 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
HOW IT SHOULD FIT – Oura Ring 4 should fit securely and comfortably at the base of your finger. Your ring should not rotate as you go about normal daily tasks. We recommend wearing your ring sizer for at least 24 hours to confirm your best fit
Customers say
Customers find the Oura Ring 4 to be a high-quality device that’s better than an Apple Watch, with positive feedback about its style, particularly the app’s flashy interface, and sleep tracking features. The battery life and functionality receive mixed reviews – while some say it charges for days and works impressively, others report it doesn’t last and stops working after a week. The activity tracking and value for money also get mixed reactions, with some finding it decent while others say it’s not accurate, and some considering it worth the money while others find it overpriced. The ring’s scratch resistance is a concern, with customers noting it scratches fairly easily.