The item is a practical arm bag, which is mainly made of durable and elastic fabric. A perfect companion arm bag to hold and keep your phone safe and dry while your are doing exercises, such as running, biking, sport, walking, etc. Features - Color: Black. - Material: Polyester, spandex. - Size M: About 16x12x0.2cm/6.3x4.72x0.08inch. - Made of fabric material,elastic, durable and safe. - Free your hands and prevent your phone dropping and the other damages while your are running, biking, sport, walking, and doing other exercises. - You can install it easily. You can enjoy your music when you running freely. - Anti-slip epoxy design on the back, more stable. - Elastic fabric for adjusting it to the size of your arm.