Oura Ring 5, the world's smallest smart ring, puts 50+ health metrics at your fingertips. Ultra-thin and 40% smaller than Oura Ring 4. Designed to wear like jewelry. Made to move with you, every day. Track 50+ health metrics with research-grade accuracy for a clearer view of your holistic health and wellbeing. 6-9 days of battery life. A rebuilt battery and tuned firmware make the smallest Oura Ring the longest-lasting yet. Choice of Black or Silver, color will be selected after sizing kit is received. Upon redemption from Goody, you'll first you'll be shipped a sizing kit to help you determine your correct size and color choice. Your selected ring ships ONLY after completing the sizing process. An active Oura Membership is required to unlock full functionality (not included). All sales final.