The present application discloses an adjustment assembly and a headrest. The adjustment assembly includes: a guiding rod; a fixing member, fixed to an end of the guiding rod; a driving portion, movably connected to the fixing member; and a first screw, engaged to the fixing member with threads, and the driving portion is connected to the fixing member by the first screw, wherein the driving portion includes a first motor, and the first motor is used to drive the driving portion to linearly move in respect to the fixing member along a direction close to or away from the fixing member. The adjustment assembly of the application can be adjusted electrically, such that the operation is convenient, and the structure is simple and reliable.

A headrest includes a housing defining a channel therethrough, a primary support cushion disposed on the housing, and an extension cushion disposed within the channel and translatable between a stowed position in which the extension cushion is stored within the channel and an extended position in which the extension cushion extends from the housing. A vehicle includes a body defining a passenger compartment and a seat disposed within the passenger compartment. The seat includes a frame, a seating surface supported by the frame, and the headrest attached to the frame. A method of adjusting the headrest includes determining whether the vehicle is in a parked or driving state and whether an actuator is in an on or off condition. If the actuator is in the on condition and the vehicle is in the parked state, the method includes translating the headrest from the stowed to the extended position.

A headrest includes a housing defining a channel therethrough, a primary support cushion disposed on the housing, and an extension cushion disposed within the channel and translatable between a stowed position in which the extension cushion is stored within the channel and an extended position in which the extension cushion extends from the housing. A vehicle includes a body defining a passenger compartment and a seat disposed within the passenger compartment. The seat includes a frame, a seating surface supported by the frame, and the headrest attached to the frame. A method of adjusting the headrest includes determining whether the vehicle is in a parked or driving state and whether an actuator is in an on or off condition. If the actuator is in the on condition and the vehicle is in the parked state, the method includes translating the headrest from the stowed to the extended position.