ABSORBING RAIL

A fastening system and a method for fastening an item in the fastening system adapted for a cargo or back space of a vehicle, are disclosed. The system comprises at least one elongated fastening rail (11) for fastening an item (123) and where the fastening rail is adapted to be attached to an inner surface of a cargo or backspace of a vehicle. The item is further arranged to move along the rail when subjected to a force above a predefined threshold value and to not move when subjected to forces below that treshold value. Hereby, safety can be improved for drivers and passengers of a vehicle having a fastening system in the cargo or back space in the event of e.g. a collision.