An energy absorber (10, 10′, 1010, 1110) includes a monolithic length of ductile material (20,1020,1120) comprising a first end (20a, 1020a, 1120a) and a second end (20b, 1020b, 1120b). The material is formed to include at least a first longitudinally extending section (40, 401, 1040, 1140) that extends continuously between the ends, a first discontinuous section (50a, 50a′ 1050a, 1150a) extending longitudinally from the first end toward the second end and at least a second discontinuous section (50b, 50b′, 1050b, 1150b) extending longitudinally from the second end toward the first end. The first longitudinally extending section is deformed over at least a portion thereof out of a plane running through both ends. The first discontinuous section and the second discontinuous section are connected such that tensile force of a threshold magnitude is required between the ends to disconnect the first discontinuous section from the second discontinuous section, letting the first longitudinally extending section free to deform under tensile force and extend in longitudinal direction.