SIZING IS ESSENTIAL - Oura Ring 5 requires unique sizing different from standard jewelry rings; use the Oura Ring 5 Sizing Kit to find your perfect fit before purchasing OURA MEMBERSHIP - First month of membership is included with purchase, for new Oura members REBUILT FOR GREATER ACCURACY - Oura Ring 5 has been re-engineered and reconfigured for more precise personal health data. Larger, smarter sensors bring research-grade accuracy in Oura's smallest form factor yet EVERYDAY HEALTH SENSING - Oura tracks 50+ health metrics including sleep, activity, stress, heart health, metabolic health and women's health. Seamlessly integrates with 40+ apps including Natural Cycles, Flo & Strava DIVE DEEPER WITH AI - Oura Advisor provides sound guidance as you make moves toward more sustained energy levels, better sleep, and many other health benefits