A system including a seatback frame having a lower frame and an upper frame carried by and movable relative to the lower frame between a retracted position and an extended position. An actuator is operatively coupled to the upper frame to move the upper frame between the retracted position and the extended position.

A headrest includes a cushion section configured to contact the back of a user's head, wherein the cushion section includes a hollow portion formed therein, and the cushion section includes a bulging portion bulging toward the back of the user's head at a central portion of an opposing surface of the cushion section, the opposing surface facing the back of the user's head.

A headrest includes a cushion section configured to contact the back of a user's head, wherein the cushion section includes a hollow portion formed therein, and the cushion section includes a bulging portion bulging toward the back of the user's head at a central portion of an opposing surface of the cushion section, the opposing surface facing the back of the user's head.

A utility vehicle, which includes a seat and can travel on rough terrain, is provided. The seat includes a sitting part that can seat three passengers side by side in a right-left direction that is a width direction of the vehicle, and a backrest part. The sitting part includes a first sitting part in a left region, a second sitting part in a right region, and a third sitting part in a central region, in the right-left direction. The third sitting part includes a protruding part protruding upward of the first and second sitting parts. The height of a sitting surface of the third sitting part relative to sitting surfaces of the first and second sitting parts monotonously decreases from rear to front.

A utility vehicle, which includes a seat and can travel on rough terrain, is provided. The seat includes a sitting part that can seat three passengers side by side in a right-left direction that is a width direction of the vehicle, and a backrest part. The sitting part includes a first sitting part in a left region, a second sitting part in a right region, and a third sitting part in a central region, in the right-left direction. The third sitting part includes a protruding part protruding upward of the first and second sitting parts. The height of a sitting surface of the third sitting part relative to sitting surfaces of the first and second sitting parts monotonously decreases from rear to front.

A seat assembly for an automotive vehicle can include a continuous frame securable to a chassis of the automotive vehicle. The continuous frame can include a seat portion, a backrest portion, and a hinge. The hinge can be connected to the seat portion and the backrest portion. The hinge can be configured to flex to allow relative movement of the backrest portion with respect to the seat portion.

A seat assembly for an automotive vehicle can include a continuous frame securable to a chassis of the automotive vehicle. The continuous frame can include a seat portion, a backrest portion, and a hinge. The hinge can be connected to the seat portion and the backrest portion. The hinge can be configured to flex to allow relative movement of the backrest portion with respect to the seat portion.

A head rest includes: a stay supported by a seat back of a vehicle seat; and an accommodation member forming an accommodation space for accommodating a part of the stay, in which the accommodation member includes a first member, a second member, and third member, the first member and the second member being disposed side by side in a front-rear direction of the vehicle seat, and the third member covering a space between the first member and the second member, and in which the third member includes a pair of side surface portions and an upper surface portion, the pair of side surface portions being disposed side by side in a left-right direction of the vehicle seat, and the upper surface portion connecting end portions of the pair of side surface portions on an upper side of the vehicle seat.

A head rest includes: a stay supported by a seat back of a vehicle seat; and an accommodation member forming an accommodation space for accommodating a part of the stay, in which the accommodation member includes a first member, a second member, and third member, the first member and the second member being disposed side by side in a front-rear direction of the vehicle seat, and the third member covering a space between the first member and the second member, and in which the third member includes a pair of side surface portions and an upper surface portion, the pair of side surface portions being disposed side by side in a left-right direction of the vehicle seat, and the upper surface portion connecting end portions of the pair of side surface portions on an upper side of the vehicle seat.