1. Small size, large capacity, although small, full capacity, mobile phones, keys, access cards, headphones, can all be accommodated. 2.Waterproof fabric.Don't worry about getting wet with the items in the bag. 3. Breathable, not stuffy, comfortable and close-fitting, honeycomb mesh design, accelerating internal and external air circulation, breathable, refreshing and not stuffy. 4. Double powerful hook and loop can be adjusted at will, and it can be adjusted at will according to its own arm circumference. 5. Reflective design at night is fashionable and cool, and fun run is safer. Material: Oxford cloth+polyesterColor: black, white, pinkBag size: 17*9cmApplicable scenes: running, fitness, cycling, yoga and so on.Package content: sports arm bag * 11. Small size, large capacity, although small, full capacity, mobile phones, keys, access cards, headphones, can all be accommodated. 2. The outer waterproof fabric is not afraid of challenges, and the fabric is not afraid of getting wet in rainy days after being treated with anti-splashing. 3. Breathable, not stuffy, comfortable and close-fitting, honeycomb mesh design, accelerating internal and external air circulation, breathable, refreshing and not stuffy. 4. Double powerful hook and loop can be adjusted at will, and it can be adjusted at will according to its own arm circumference. 5. Reflective design at night is fashionable and cool, and fun run is safer.