The sensors in the Oura Ring have been tested against laboratory results in multiple validation studies. Learn more about Science & Research at Oura.

Oura Ring is water-resistant up to 100 meters (~330 feet), meaning that you can wear it while showering, swimming, or partaking in recreational diving (e.g. snorkeling), but we don’t recommend using your Oura Ring while scuba diving or keeping it submerged underwater for over 12 hours. Chlorine will not damage it.
Oura Ring operating temperature ranges from -10–52°C / 14–125°F. You can safely wear your Oura Ring in the shower, hot tubs, saunas, ice baths, and cryotherapy tanks. However, extended exposure to extreme temperatures (below -20°C / -4°F or above 60°C / 140°F) may lead to battery damage.

Oura Ring gives a complete picture of your health, including:

Readiness

Sleep

Activity

Daytime Stress and Resilience

Heart Health: Cardiovascular Age and Cardio Capacity

Women’s Health: Cycle Insights, Fertile Window, and Pregnancy Insights

Oura Membership unlocks the full potential of the Oura App, allowing you to access detailed insights and personalized guidance. Without a membership, the Oura Ring can be used only with limited functionality.

We recommend you use an Oura Ring sizing kit before selecting your Oura Ring size. The kit includes plastic ring sizers corresponding to Oura Ring sizes, which differ slightly from standard ring sizes (note: half sizes are not available).
For accuracy, wear the sizing ring for at least 24 hours, including while sleeping, before finalizing your size. If you’re between sizes, we recommend choosing the smaller size for a more secure fit. Visit our Sizing Page for more information.