It is a necessity for you to carry your necessities in sports and running, and you can quickly and effectively get the items you need while wearing it.Adjustable elastic band can be easily used in winter.Waterproof - contains diving fabrics, even under the condition of running in the rain the whole package was wet, still can guarantee the inside of the bag is dry (hint: to put the headphones on the bag when get wet in the rain more secure)The main bag is transparent and can be easily operated without taking out the phone.Multi-function - there are special headphone holes designed to allow you to enjoy the wonderful music while exercising.