POWER HEAD RESTRAINT FLEXIBLE CLOSEOUT COVER

A vehicle seat includes a seatback having an upper portion. An adjustable headrest assembly is supported on the upper portion of the seatback. The adjustable headrest assembly has a headrest bun and an adjustment mechanism for adjusting the headrest bun between extended and retracted positions. A trim component is disposed on the upper portion of the seatback having a relief portion. The relief portion is configured to receive a portion of the adjustment mechanism as the headrest bun is driven towards the extended position. A flexible cover member is coupled to the trim component at the relief portion. The flexible cover member has a plate member operable between extend and retracted positions. The portion of the adjustment mechanism abuts an inner surface of the plate member to move the plate member towards the extended position as the headrest bun is driven towards the extended position.