5.3" - iPhone X

DESIGNED FOR YOUR IPHONE 8 : The lightweight arm band is designed to hold your iPhone 8 (Not Plus) with Fingerprint ID Access. Listen to music, take calls and track your fitness, without the inconvenience of removing your smartphone.
SWEAT & RAIN PROTECTION – The NEW advanced Lycra material has a waterproof coating, so it will block water from getting to your phone. Run in the rain or sweat hard in the gym knowing your phone is protected. (Not for Submerging)
SMALL – LARGE ARMS – Whatever your arm size, the phone holder is secure and will not fall down during exercise. The adjustable armband comes with a bonus extender strap included, perfect to fit all arm circumferences: SMALL 9″ – LARGE 17.5″ inches