Track your sleep, activity, and recovery trends to help you understand and improve your overall wellnessSleep Index evaluates your total sleep duration, resting heart rate, and restfulness to provide a complete overview of your sleep qualitySkin temperature is essential for tracking your body's response to factors like exercise, stress, and illness, offering insights into your overall physiological stateThe Phase Response Curve (PRC) explains how stimuli like light, food, or exercise influence changes in your body's circadian rhythmReceive personalized insights and alerts that guide you to make healthier choices in real timeInterior is coated with medical-grade hypoallergenic epoxy resin, ensuring all-day comfortOuter shell of the ring is crafted from fighter jet-grade titanium, reinforced with a tungsten carbide carbon coating for superior durabilityRing size: 13