The largest, most advanced Always-on Retina display yet makes everything you do with your Apple Watch Series 8 bigger and better. Series 8 is the most durable Apple Watch ever built, with an even more crack-resistant front crystal. Advanced features let you measure your blood oxygen level,¹ take an ECG anytime,² and access mindfulness and sleep tracking apps. You can also track dozens of workouts, including new tai chi and pilates.