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

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. The Oura Ring 4 Sizing Kit allows for you, and those around you, to find the ideal fit before purchasing. You can also size yourself in stores where there is an Oura Ring 4 display. A properly fitting Oura Ring will result in the highest possible data accuracy, comfort, and overall experience.

Introducing the world’s smallest smart ring—Oura Ring 5, built with even more sensing power than previous generations. 40% smaller and ultra lightweight, Oura Ring 5 fits seamlessly in with your life and your style. The updated all-titanium design is more scratch-resistant and comfortable than ever, Oura Ring 5 delivers 50+ health metrics with research-grade accuracy. With 6-9 days of battery life you can even forget it’s on. No more compromises when it comes to tracking your health. IMPORTANT: Size yourself with the Oura Ring 5 Sizing Kit before you buy — Oura Rings are not US standard sizing and other Oura Ring generations, and finding the right size will result in the best experience possible. With an Oura Ring 5 Sizing Kit purchase, you will receive a $10 Best Buy gift card to use towards your Oura Ring 5 purchase.

Oura Ring 4 brings you closer to what matters most — your health. With an updated all-titanium design, this smart ring features Smart Sensing, a new sensing platform that doesn’t just measure your biometrics but also adapts to you. It provides insights into over 50 biometrics including sleep, readiness, activity, heart health, stress, metabolic health and women’s health.