Take charge of your well-being with the Oura Ring 4 Ceramic. Powered by Smart Sensing, this smart ring does more than just measure your biometrics—it adapts to you. Gain insights across 50+ health metrics, including sleep, readiness, activity, heart health, stress, metabolic health and women’s health, to help you make smarter choices every day. Retail Exclusive at Best Buy. | Oura Ring 4 Ceramic Sleep & Fitness Smart Ring - Midnight - Size 4 - Retail Exclusive at Best Buy