The Oura Ring Gen3 Horizon tracks over 20 biometrics to provide insights into your sleep, readiness, and daily activity. With an Oura Membership (sold separately), access features like in-depth sleep analysis, personalized health insights, and live heart rate monitoring. The ring automatically detects your activity and awards credits. The daily Readiness Score helps you optimize your performance and recovery. Key features include a non-allergenic, lightweight titanium design for comfort day and night, water resistance up to 100 meters, and a battery life of up to 7 days. It also monitors daytime stress levels, heart rate for cardiovascular insights, and skin temperature for illness detection and menstrual cycle tracking. For the most comfortable fit, it's recommended to purchase the Oura Ring Gen3 Sizing Kit as sizing differs from standard ring sizes. Some tracking and insight features require an Oura Membership; non-paying members have access to daily Sleep, Readiness, and Activity scores, plus Explore content.