The Oura Ring brings many features you'd find in a wrist-based fitness wearable and places them on the user's finger. An array of sensors monitor a person's temperature, heart rate, heart rate variability and movement throughout the day and based on these metrics, as well as tracked sleep data, a daily readiness score is generated for the wearer. This score can inform your body's state for the day which may influence the intensity of your activities or exercises in the day ahead. There are two main styles of Oura rings with multiple finishes for each style.