Abstract: A method for safe restraint of occupants in a crashing vehicle using safety belts, and a double tube frame construction vehicle seat. In a crash the kinetic energy of the occupant is restrained by the belt and by the cooperating resiliently deformable double tube frame construction in such a way that, at a moderate load, the upper portion of this double tube frame construction will move resiliently, but with a bigger load a permanent deformation will be the result. The device includes a seat frame with a seat portion and a back rest portion being made of a parallel tube frame having two tubes arranged above/under and forward/behind, at the seat portion and at the back rest portion respectively, up to a height at the breast of the occupant. The tubes are twisted above this height to a position side by side. Reinforcing, deformable form plates are rigidly arranged between the parallel tubes at least at the seat portion and at the lower portion of the back rest portion.