Photo 1 of Oura Ring Gen3 Heritage - Black - Size 12 - Smart Ring - Size First with Oura Ring Gen3 Sizing Kit - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - 5-7 Days Battery Life

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Photo 1 of Oura Ring Gen3 Heritage - Black - Size 12 - Smart Ring - Size First with Oura Ring Gen3 Sizing Kit - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - 5-7 Days Battery LifePhoto 2 of Oura Ring Gen3 Heritage - Black - Size 12 - Smart Ring - Size First with Oura Ring Gen3 Sizing Kit - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - 5-7 Days Battery LifePhoto 3 of Oura Ring Gen3 Heritage - Black - Size 12 - Smart Ring - Size First with Oura Ring Gen3 Sizing Kit - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - 5-7 Days Battery LifePhoto 4 of Oura Ring Gen3 Heritage - Black - Size 12 - Smart Ring - Size First with Oura Ring Gen3 Sizing Kit - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - 5-7 Days Battery LifePhoto 5 of Oura Ring Gen3 Heritage - Black - Size 12 - Smart Ring - Size First with Oura Ring Gen3 Sizing Kit - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - 5-7 Days Battery Life