Measure your blood oxygen level with a revolutionary new sensor and app. Take an ECG anytime, anywhere. See your fitness metrics at a glance with the enhanced Always-On Retina display. With Apple Watch Series 6 on your wrist, a healthier, more active, more connected life is within reach. The aluminum case is lightweight and made from 100 percent recycled aerospace-grade alloy. The Nike Sport Band is made from a durable high-performance fluoroelastomer with compression-molded perforations for breathability.