An adjustable vehicle seat configured to support an occupant in a vehicle, comprising: a seat cushion portion; a seat back portion including a backrest movable relative to the seat cushion portion; a contour linkage linked to the seat cushion portion and the backrest, wherein the contour linkage is configured to impose force on the backrest upon movement of the seat cushion portion relative to the backrest in at least one of a fore/aft direction, a vertical direction, and a rotational direction, wherein the backrest is configured such that a backrest contour is altered based on force imposed by the contour linkage in response to movement of the seat cushion portion relative to the backrest, wherein the backrest contour that is altered includes at least one of a contour angle of an occupant-side surface of the backrest relative to a vertical axis, a maximum offset of the occupant-side surface relative to a standard position of the occupant-side surface, and vertical height of a contour apex of the occupant-side surface, characterised in that the contour linkage is positioned near a bite line of the vehicle seat, and directly connects the backrest to the seat cushion portion, wherein the contour linkage is configured to move a bottom portion of the backrest, which changes the curvature of the backrest due to the flexibility of a flexible support structure within the backrest, wherein, when at least one of the seat cushion portion is moved forward in the fore/aft direction and the contour linkage and the bite line move forward with the seat cushion portion _or a front portion of the seat cushion portion is rotated upward in the rotational direction, and the contour linkage rotates clockwise, the contour linkage pulls the backrest downward and into the bite line; and an upper anchor attached to an upper region of the backrest, wherein the upper anchor includes a track slide that is movable at least partially along the length of the seat back portion along a guide within a seat frame to allow the upper anchor to move along the guide within the seat frame as the seat cushion portion moves in order to move the backrest relative to the guide to change the contour of the backrest. a seat cushion portion; a seat back portion including a backrest movable relative to the seat cushion portion; a contour linkage linked to the seat cushion portion and the backrest, wherein the contour linkage is configured to impose force on the backrest upon movement of the seat cushion portion relative to the backrest in at least one of a fore/aft direction, a vertical direction, and a rotational direction, wherein the backrest is configured such that a backrest contour is altered based on force imposed by the contour linkage in response to movement of the seat cushion portion relative to the backrest, wherein the backrest contour that is altered includes at least one of a contour angle of an occupant-side surface of the backrest relative to a vertical axis, a maximum offset of the occupant-side surface relative to a standard position of the occupant-side surface, and vertical height of a contour apex of the occupant-side surface, characterised in that the contour linkage is positioned near a bite line of the vehicle seat, and directly connects the backrest to the seat cushion portion, wherein the contour linkage is configured to move a bottom portion of the backrest, which changes the curvature of the backrest due to the flexibility of a flexible support structure within the backrest, wherein, when at least one of the seat cushion portion is moved forward in the fore/aft direction and the contour linkage and the bite line move forward with the seat cushion portion _or a front portion of the seat cushion portion is rotated upward in the rotational direction, and the contour linkage rotates clockwise, the contour linkage pulls the backrest downward and into the bite line; and an upper anchor attached to an upper region of the backrest, wherein the upper anchor includes a track slide that is movable at least partially along the length of the seat back portion along a guide within a seat frame to allow the upper anchor to move along the guide within the seat frame as the seat cushion portion moves in order to move the backrest relative to the guide to change the contour of the backrest.