1It has reflective surface design, which can give off light at night, so that you can exercise more safely. 2There are anti-slip particles inside the armband to ensure that the armband will not slip off during exercise. 3Ultralight material, soft and comfortable, more convenient and tightly fit the arm. 4It is very suitable for people who like to run, lift weights, hike, walk the dog or go out. 5It will not squeeze and damage your phones, ensuring your phone's safety.