Oura Ring Gen3 Heritage - Black - Size 10 - Smart Ring - Size First with Oura Ring Gen3 Sizing Kit - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - 5-7 Days Battery Life

SIZE BEFORE YOU BUY – Size with Gen3 Sizing Kit prior to purchasing Oura Ring Gen3 (different sizing from Oura Ring 4). For additional details, see “From the brand” section below.THE REVOLUTIONARY SMART RING - Track your sleep, activity, stress, heart rate and more with the Oura Membership. First month included for new members, then is 5.99/mo. Register for Oura Membership on the Oura App. Oura Membership is not sold on AmazonMORE ACCURATE BY DESIGN - Your finger provides the most accurate pulse reading, making your health data and insights more personal than ever. Oura Ring’s research grade sensors monitor over 20 biometrics with precisionSYNC WITH YOUR FAVORITE APPS - Compatible with iOS and Android — Oura seamlessly integrates with over 40 apps including Apple Health, Google Health Connect, Natural Cycles, Flo, Strava, & moreHSA/FSA ELIGIBLE - We can accept HSA or FSA funds for the following: Oura Ring, and additional chargers