-Side sill part for an automotive vehicle, extending along a substantially longitudinal direction, comprising at least: - an outer sill member and an inner sill member, made of a substantially rigid material, and defining between them an outer volume, the outer sill member comprising at least one inner contact surface and the inner sill member comprising at least one outer contact surface, at least a part of the outer contact surface of the inner sill member being spaced from at least a part of the inner contact surface of the outer sill member according to a transversal direction substantially perpendicular to the longitudinal direction, - an external profile part, defining with the inner sill member an inner volume, the external profile part comprising an outer contact surface at least in part spaced from an inner contact surface of the inner sill member according to the transversal direction, - a first profile part extending in the outer volume, the first profile part comprising at least one outer contact portion, applied against the inner contact surface of the outer sill member, at least one inner contact portion, extending opposite the outer contact surface of the inner sill member, and at least one joining wall joining the outer contact portion and the inner contact portion along the transversal direction, the first profile part presenting a first crushability in the transversal direction, the first crushability being defined by the necessary amount of energy or by the necessary amount of force required to crush the first profile part, the first crushability being greater as the necessary amount of energy or the necessary force is reduced, - a second profile part extending in the inner volume, the second profile part comprising at least one outer contact portion, applied against the inner contact surface of the inner sill member, at least one inner contact portion, extending opposite the outer contact surface of the external profile part, and at least one joining wall joining the outer contact portion and the inner contact portion along the transversal direction, the second profile part presenting a second crushability in the transversal direction, the second crushability being defined by the necessary amount of energy or by the necessary amount of force required to crush the second profile part, the second crushability being greater as the necessary amount of energy or the necessary force is reduced, wherein the external profile part presents a third crushability in the transversal direction, the third crushability being defined as by the necessary amount of energy or by the necessary amount of force required to crush the external profile part, the third crushability being greater as the necessary amount of energy or the necessary force is reduced characterized in that the third crushability is inferior to the second crushability, the second crushability being inferior to the first crushability. - an outer sill member and an inner sill member, made of a substantially rigid material, and defining between them an outer volume, the outer sill member comprising at least one inner contact surface and the inner sill member comprising at least one outer contact surface, at least a part of the outer contact surface of the inner sill member being spaced from at least a part of the inner contact surface of the outer sill member according to a transversal direction substantially perpendicular to the longitudinal direction, - an external profile part, defining with the inner sill member an inner volume, the external profile part comprising an outer contact surface at least in part spaced from an inner contact surface of the inner sill member according to the transversal direction, - a first profile part extending in the outer volume, the first profile part comprising at least one outer contact portion, applied against the inner contact surface of the outer sill member, at least one inner contact portion, extending opposite the outer contact surface of the inner sill member, and at least one joining wall joining the outer contact portion and the inner contact portion along the transversal direction, the first profile part presenting a first crushability in the transversal direction, the first crushability being defined by the necessary amount of energy or by the necessary amount of force required to crush the first profile part, the first crushability being greater as the necessary amount of energy or the necessary force is reduced, - a second profile part extending in the inner volume, the second profile part comprising at least one outer contact portion, applied against the inner contact surface of the inner sill member, at least one inner contact portion, extending opposite the outer contact surface of the external profile part, and at least one joining wall joining the outer contact portion and the inner contact portion along the transversal direction, the second profile part presenting a second crushability in the transversal direction, the second crushability being defined by the necessary amount of energy or by the necessary amount of force required to crush the second profile part, the second crushability being greater as the necessary amount of energy or the necessary force is reduced,