Abstract: The present invention provides an improved head restraint device for securing a person's head to a headrest such as those found on vehicle passenger seats. The head restraint immobilizes the person's head, neck, and spine in all degrees of freedom, e.g., lateral, longitudinal or frontal, and rotational, relative to the headrest. Yet, when a threshold amount of external force is applied to the person's head, particularly in a frontal or normal direction relative to the passenger seat, the person's head will separate itself from the headrest to prevent injury to the person.