An extension on the upper portion of the seatback. Some are permanently attached and other are adjustable. They are designed to reduce whiplash injuries caused by sudden stopping or collisions. They limit the rearward motion of the head and neck. Some head restraints contain radio speakers.
HEAD RESTRAINT
Meaning of HEAD RESTRAINT in English
English dictionary of automotive terms. Английский словарь автомобильных терминов. 2012