The aluminum case is lightweight and made from 100 percent recycled aerospace-grade alloy. The Sport Band is made from a durable yet surprisingly soft high-performance fluoroelastomer with an innovative pin-and-tuck closure.
Features:

Stay motivated to move throughout the day with Activity rings

Call, text, and email from your wrist

Track all your favorite workouts, now including Pilates and Tai Chi

Check your heart rate anytime. And get alerts for unusually high or low heart rates