Answer: Head restraints
Explanation:
The head restraints or known as head rests are structure found in the four wheels for the automotive safety feature which helps in the protection of the neck and head.
This paded structure is attached to the top of each seat to limit the direct backward movement of the occupant's head relative to the torso.
In case of collision, it prevents the injury of the cervical vertebrate. It provides protection to the neck and the head region.