The Classic Series Sporteer armband is designed by athletes, for athletes. Weighing in at just under 1.5oz, the Classic Series defines simplicity. No posers here, just a well designed product for a serious athlete. The Classic Series works best without a case attached to the device and is designed for specific devices to ensure an exact fit for the earphone jack and screen functionality. Fits the iPhone 5s/5c/5. Size M/L fits arm size of 11"-15".