The Oura Ring 4 Smart Ring Health Activity Tracker – Gold (Ring Size 15) | JZ90-54216-15 combines timeless luxury with advanced health tracking technology. Crafted from premium titanium in an elegant gold finish, this durable yet lightweight smart ring is designed for 24/7 comfort and performance. Equipped with Smart Sensing technology, it continuously tracks over 30 biometrics such as heart rate, sleep stages, stress, activity, and women’s health metrics — adapting intelligently to your body to deliver accurate insights day and night. With up to 8 days of battery life and USB-C fast charging, it ensures uninterrupted use, while its water-resistant and hypoallergenic build makes it ideal for all lifestyles. The Oura Ring 4 seamlessly integrates with Apple Health, Google Fit, Strava, and Natural Cycles for a connected wellness ecosystem. Paired with the Oura Membership app, it provides personalized analytics to help you optimize recovery, sleep, and overall well-being—all in a minimalist, screen-free design that blends elegance with innovation.