A cushion for vehicle seat comprising: - a padding having a front face intended to receive a portion of the occupant, and a rear face intended to bear on a frame of the seat, opposite lateral faces (22, 23), and opposite end faces (24, 25), - a coating covering at least the front face, or even all or part of the lateral faces (22, 23) and/or the end faces (24, 25), characterised in that the padding comprises a first slot and a second slot, each extending in length along at least one section of the length of the cushion between the two end faces (24, 25) of the padding, the first slot and the second slot being respectively through slots from the front face to the rear face, the first slot and the second slot dividing the padding along a transverse direction into three portions, including a central portion, a first lateral portion and a second lateral portion disposed on either side of the central portion, the first slot delimited between an inner wall of the first lateral portion and a first outer wall of the central portion, the second slot delimited between an inner wall of the second lateral portion and a second outer wall of the central portion and wherein a first rigid wire portion which is secured to the first lateral portion extends at the first slot, along the inner wall of the first lateral portion, and a second rigid wire portion, which is secured to the second lateral portion extends at the second slot, along the inner wall of the second lateral portion, and wherein said cushion comprises a clipping system with a first clip system at the first outer wall, configured to be reversibly fastened on the first wire portion, and a second clip system at the second outer wall configured to be removably fastened on the second wire portion by ensuring the maintenance of the central portion of the padding blocked between the first lateral portion and the second lateral portion and wherein when the first clip system and the second clip system are respectively detached from the first wire portion and the second wire portion, the central padding portion is released, configured to be removable relative to the first lateral portion and the second lateral portion by releasing an access opening (Oa) between said first lateral portion and said second lateral portion then intended to remain fastened to the seat frame. - a padding having a front face intended to receive a portion of the occupant, and a rear face intended to bear on a frame of the seat, opposite lateral faces (22, 23), and opposite end faces (24, 25), - a coating covering at least the front face, or even all or part of the lateral faces (22, 23) and/or the end faces (24, 25), characterised in that the padding comprises a first slot and a second slot, each extending in length along at least one section of the length of the cushion between the two end faces (24, 25) of the padding, the first slot and the second slot being respectively through slots from the front face to the rear face, the first slot and the second slot dividing the padding along a transverse direction into three portions, including a central portion, a first lateral portion and a second lateral portion disposed on either side of the central portion, the first slot delimited between an inner wall of the first lateral portion and a first outer wall of the central portion, the second slot delimited between an inner wall of the second lateral portion and a second outer wall of the central portion and wherein a first rigid wire portion which is secured to the first lateral portion extends at the first slot, along the inner wall of the first lateral portion, and a second rigid wire portion, which is secured to the second lateral portion extends at the second slot, along the inner wall of the second lateral portion, and wherein said cushion comprises a clipping system with a first clip system at the first outer wall, configured to be reversibly fastened on the first wire portion, and a second clip system at the second outer wall configured to be removably fastened on the second wire portion by ensuring the maintenance of the central portion of the padding blocked between the first lateral portion and the second lateral portion and wherein when the first clip system and the second clip system are respectively detached from the first wire portion and the second wire portion, the central padding portion is released, configured to be removable relative to the first lateral portion and the second lateral portion by releasing an access opening (Oa) between said first lateral portion and said second lateral portion then intended to remain fastened to the seat frame.