Size Large fits wrists 7.3″-8.5″ Continuous heart rate monitor tracks your heart rate, calorie burn, and sleep quality. Works with Windows Phone, Android and iPhone* Get email, text, calendar, and call alerts on the go Tracking for running, biking, golf, and more
https://www.amazon.com/Microsoft-4M5-00003-Band-2-Large/dp/B0163COWP2

