Mixxfit iPhone Phone Sport Case Armband Adjustable for All Size Arms. Designed for Iphone 4s, 4g As Well As Iphone 5s, 5c and 5g. Reflective, Comfortable Neoprene Material for Gym Workouts, Running, Jogging or Biking. Sweat-proof and Quick-dry Neoprene with Key Holder SPECIFICALLY DESIGNED for iPhone 4, 4s, 4c, iPhone 5, 5s, 5c, 5g SOFT COMFORTABLE NEOPRENE offer a optimal protection for your Smartphone with a KEY Slot STRETCHABLE, WASHABLE and SWEAT Resistant neoprene material ADJUSTABLE VELCRO lets you adjust your armband for big and small arms EASY TO INSTALL with access to headphones, enjoy wonderful music when jogging, cycling or working out in the Gym