The Oura Smart Ring 4 in Black (Size 8) is a sleek, ultra-lightweight titanium wearable engineered to accurately track sleep metrics, daily activity levels, and cardiac health. Powered by "Smart Sensing" technology, it adapts dynamically to the unique contours of your finger to maintain constant contact with your skin, maximizing biometric precision without sacrificing comfort.
Key Features
Smart, adaptive, and uniquely yours.
Our new Smart Sensing Technology provides enhanced accuracy, deeper personalization, and longer battery life.
Crafted with a slim full-titanium body and discrete sensors for comfortable 24/7 wear.
Get 5–8 days of battery life from a single charge, keeping your health tracking going day and night.
Membership That Evolves With You
Track over 50 health and wellness metrics and gain personalized insights into your sleep, activity, stress, metabolism, heart health, and women’s health. With innovative AI tools like Oura Advisor, you’ll receive tailored guidance and actionable recommendations that become more accurate and relevant over time.
Accurate Sleep Pattern Analysis
Designed to track total sleep, heart rate variability, nighttime movement, and sleep consistency, this Oura Ring 4 Size 8 Smart Ring delivers a detailed sleep score each morning. In addition, it provides a clear breakdown of deep, REM, and light sleep stages from the previous night. Hence, you can evaluate how well you rested and adjust your daily schedule to support improved recovery.
Holistic Wellness Monitoring
Supporting 24/7 heart rate tracking, blood oxygen sensing, and temperature trend analysis, this size 8 smart ring offers continuous insight into your body’s responses. In addition, metrics such as cardiovascular age, cardio capacity, and heart rate variability help you interpret long-term heart health patterns. Therefore, you can understand how daily routines, stress, and physical effort influence overall well-being.
Daily Readiness Insights
Featuring a Readiness Score, this ring evaluates sleep quality, heart rate, and body temperature trends to indicate how prepared you are for the day. As a result, you can plan workouts, work commitments, or rest periods based on personalised recovery feedback.
Intelligent Activity Tracking
Capable of detecting over 40 activities automatically, this smart ring monitors movement alongside heart rate data. Moreover, personalised activity goals adapt according to your recovery status. Thus, you can maintain a balanced rhythm between movement and rest throughout the week.
Stress Response Insights
Monitoring daytime stress levels and cumulative strain, this ring highlights how your body manages ongoing demands. Hence, you can identify stress patterns and take timely steps to support recovery.
Women’s Cycle Tracking
Using temperature trends, this smart ring delivers cycle insights and period predictions. In addition, integration with compatible apps such as Natural Cycles and Clue allows synced tracking through the Oura app. Therefore, you can monitor menstrual health data with clarity and consistency.
Seamless Smart Connectivity
Compatible with the Oura app on Android and iOS, this ring connects through Bluetooth BLE and supports automatic firmware updates. With 5-8 days of battery life and aeroplane mode availability, you can rely on steady performance with minimal disruption.
Water-Resistant Build
Designed with water resistance up to 100m, this smart ring supports continued use during workouts, showers, or swimming sessions. The durable structure allows dependable tracking across daily activities.
Lightweight Everyday Wear
Weighing between 3.3g and 5.2g depending on the size, this smart ring maintains a light and steady presence on your finger. Its balanced design ensures comfortable extended use, allowing you to monitor your well-being consistently without interruption.
Refined Titanium Form
Made from titanium, this Oura ring features a slim and lightweight profile suitable for continuous wear. Its smooth structure sits comfortably on your finger, enabling day and night tracking without inconvenience.
*Images are for illustration purposes only
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