Oakley iPhone 4 Unobtainium Case The Oakley iPhone Unobtainium case is made of flexible yet durable rubber material that offers no-slip grip and protection against scrapes and dents. Oakley iPhone Unobtainium Case features an open face allowing full access to the screen and easy access to the back and side buttons and ports. Connect to the world while having fun outdoors. It offers your phone extra protection, and a custom look that sets it apart from the uninspired world.