Extendable vehicle seat sitting element

A vehicle seat sitting element comprising a main sitting part and a movable sitting part, movable relative to the main sitting part along an extension direction between a retracted position, wherein the movable sitting part extends against the main sitting part, and an extended position, wherein the movable sitting part is spaced apart from the main sitting part along the extension direction, said movable sitting part sliding on a frame between the retracted position and the extended position, said frame extending in the extension direction between a rear edge facing the main sitting part and a front edge facing the movable sitting part and spaced from the main sitting part in the extension direction, the sitting element further comprising a covering element extending between the main sitting part and the movable sitting part, said covering element being movable between a retracted position, wherein the covering element is folded between the main sitting part and the movable sitting part when the movable sitting part is in the retracted position, and a deployed position, wherein the covering element fills the space between the main sitting part and the movable sitting part in the extension direction when the movable sitting part is in the extended position, wherein the covering element is fastened to the frame, in the vicinity of the rear edge of said frame, by at least one elastic band, said elastic band exerting a restoring force on the covering element towards the retracted position, when said covering element is in the deployed position.