Made of high quality elastic waterproof material, it feels comfortable in hand and is sweat-proof and convenient to use. It features small size and big capacity that is convenient to carry personal effects when exercising outdoors. (such as mobile phone, keys, cards, cash, etc.) With reserved earphone jack makes it easy access to plug your earphone to your phone. The high grade buckle and zipper is aesthetic and durable and easy to use. The phosphor bar can perform warning function at night to ensure safety.