A correctly adjusted headrest can help prevent neck injury during collisions. It's important to align the headrest to cover as much as possible of the back of the head.

Upward movement of the headrest is not locked.
Pull the headrest upwards to a level that suits your height.
To lower the headrest, press and hold the button above the flip-down arm rest to release the lock. Then, carefully push the headrest down.

Tip
Make a habit of lowering the headrest when the center seat is not in use. In the lowered position, it doesn't risk obstructing the rear view.