SLIM & LIGHTWEIGHT : Made of a quick-drying Lycra cloth, the flexible arm sleeve is lightweight and easy to fit on your arm. Other phone armbands are bulky, uncomfortable and rub your skin during exercise. Our soft and comfortable material will hold your phone secure with no pinching, no irritation and no distractions. FITS YOUR PHONE & MORE : Never leave anything behind with the stretchy armband that can hold your phone, keys, cash, credit cards, inhaler and even a nutritious snack. Whether your phone is 4"or 6.5", it will fit inside even with your phone case ON. SMALL - LARGE ARMS : Finally, a phone armband that you never have to readjust or worry about slipping during physical activity. The comfortable material hugs your arm like no other armband you've used before. Please measure around your bicep circumference (un-flexed) for a guaranteed fit. X-SMALL 7.4" - 9", SMALL: 9" - 11.6", MEDIUM: 11.6" - 14.2", LARGE: 14.2" - 16.5", X-LARGE 16.5" - 18"