G-Cord&reg; Sport Armband Running Case Pouch with Key Holder for iPhone (Green) The armband is available in two different strap sizes, to accommodate different arm circumferences (11.2~12.2, 13.5~15.7) The armband is sweat-proo and dust-proof, which provides your phone with full and perfect protection Built-in hidden key holder to help you minimize carrying extra things when doing exercise; Access to earphones and controls easily (compatible for iPhone5/5s/5c, iPhone 6, Samsung Galaxy S3 and any other smartphones that smaller than 5.5) The G-Cord armband is very lightweight, flexible and extremely comfortable, which is suitable for many different sports, gym, walking, gardening and general activities - not just for running