Ida Arm Pouch is a mobile phone bag made of nylon material, soft and waterproof. Ideal for storing your phone, keys and other small things. Adjustable strap and Hook-and-Loop design allows you to adjust the tightness of the armband according to the size of the arm. Compatible with 4-6 inches mobile phones. It is sweat-wicking and breathable, perfect for outdoor activities, like marathon, etc. It is a small item but big help!