Headrests should ideally be positioned two inches or less from the rear of the driver's head, and never more than four inches. When adjusting for height, the bulk of the headrest should stand directly behind the driver's head, at ear-level.

Where does one position the head restraint in relationship to the head?

A head restraint should be at least as high as the head's center of gravity, or approximately 3.5 inches (9 cm) below the top of the occupant's head. The second criterion is the horizontal distance from the back of an average sized male's head to the front of the restraint.

What is a proper head restraint?

When it's correctly positioned, your head restraint will prevent your head and neck from jolting backwards on impact. ... Make sure the top of the head restraint is at least level with the top of your head. Position the head restraint so it's as close to the back of your head as possible.