Balfson Outdoor multifunctional arm bag

Product name: Running mobile phone arm bag
Product material: polyester material
Product features: light, comfortable, stylish and durable
Product color: green/black/blue/rose red
Suitable for the crowd: people who love fitness, love running, love riding, love sports
Product arm circumference: The arm circumference is suitable between 18-34CM (the size can be adjusted freely)