An energy-absorbing pad structure includes an energy-absorbing pad that is encapsulated by a polymeric film. The identifier and the optically coded information are structured to blend in with or hide within the logo andor design. All coded tree blocks belonging to a slice may belong to one or more columns. A fuel and water tight composition in and along the spaces prevent fuel and water leaks to ambient water and between the compartments. There can be provided a high quality elbow protection cover wherein cost performance is good, and high strength and prevention of water leak or the like can be achieved by introducing a mass-production method of elbow protection covers instead of manual operation where board members are joined by soldering or the like.