This phone arm band is made of high-grade lightweight diving material, featuring a rainproof, breathable, and sweat-absorbing design. It is suitable for outdoor activities such as jogging, walking, and cycling, and can fit mobile phones within 6.5 inches. The arm band has a large capacity, is easy to wear and take off, and has a high-viscosity connecting belt to fit your arm tightly. It is also waterproof, non-slip, and washable, making it a convenient and comfortable accessory for fitness enthusiasts.