Back protector comprising a body with energy-absorbing function extending along a longitudinal direction and comprising a plurality of portions, wherein each portion is - a structure having mobility with at least six degrees of freedom and able to provide the body with energy-absorbing function with freedom of movement according to at least six degrees of freedom; and/or - a structure able to move and return into an original position, following the following stresses: stretching along said longitudinal direction, a compression, in the opposite direction to said stretching along said longitudinal direction, a torsion in both directions of rotation about an axis passing through said body with energy-absorbing function, said axis being parallel to said longitudinal direction, a bending towards right-hand and left-hand sides of said body with energy-absorbing function about an axis orthogonal to a plane supporting said body with energy-absorbing function and orthogonal to said longitudinal direction, and/or a combination of said stresses, and allowing the body with energy-absorbing function to return into an original position following cessation of any one, or all, of said stresses, and wherein the body with energy-absorbing function includes a plurality of plate members (16, 18, 20, 22 and 24) separate from each other, wherein one portion of said portions is arranged between two successive plate members (16, 18, 20, 22 and 24) or adjacent plate members (16, 18, 20, 22 and 24), characterized in that said portion has an energy-absorbing function and is lattice-like portion which is flexible and/or has elastic properties in terms of structure and/or material, wherein said portion includes one or more elongated elements each element having a sinusoidal or wave-like configuration and being arranged or oriented in a transverse direction, or short side direction, with respect to said longitudinal direction, and wherein said sinusoidal or wave-like configuration defines a hump zone or maximum zone and a throat zone or minimum zone which alternate along said transverse or short side direction. - a structure having mobility with at least six degrees of freedom and able to provide the body with energy-absorbing function with freedom of movement according to at least six degrees of freedom; and/or - a structure able to move and return into an original position, following the following stresses: stretching along said longitudinal direction, a compression, in the opposite direction to said stretching along said longitudinal direction, a torsion in both directions of rotation about an axis passing through said body with energy-absorbing function, said axis being parallel to said longitudinal direction, a bending towards right-hand and left-hand sides of said body with energy-absorbing function about an axis orthogonal to a plane supporting said body with energy-absorbing function and orthogonal to said longitudinal direction, and/or a combination of said stresses, and allowing the body with energy-absorbing function to return into an original position following cessation of any one, or all, of said stresses, and stretching along said longitudinal direction, a compression, in the opposite direction to said stretching along said longitudinal direction, a torsion in both directions of rotation about an axis passing through said body with energy-absorbing function, said axis being parallel to said longitudinal direction, a bending towards right-hand and left-hand sides of said body with energy-absorbing function about an axis orthogonal to a plane supporting said body with energy-absorbing function and orthogonal to said longitudinal direction, and/or a combination of said stresses, and allowing the body with energy-absorbing function to return into an original position following cessation of any one, or all, of said stresses, and