A vehicle seat assembly that includes a seatback frame and an active head restraint system. The active head restraint system includes a head restraint adapted to move between an upright position and an operative position relative to the seatback frame in response to an input force applied to the active head restraint system. The head restraint is biased to resist movement away from the upright position and toward the operative position. Also, the resistance to movement of the head restraint decreases as the head restraint moves away from the upright position and toward the operative position.