A headrest assembly in combination with a vehicle seat assembly, the combination including a vehicle seat assembly having a seat bottom and a seat back assembly connected to the seat bottom. The combination also includes a headrest assembly connected to the seat back assembly. The headrest assembly has a head receiving portion that is configured for movement between a first position and a second position with respect to the seat back assembly. The seat back assembly obstructs downward adjustment of the headrest assembly below a predetermined height when the head receiving portion is in the first position. The headrest assembly can be downwardly adjustable below the predetermined height when the head receiving portion is in the second position.