FORD 2002 Explorer v.3 - Manual (Page 142)

REAR SEATS
Adjustable head restraints
Your vehicle’s seats may be equipped with head restraints which are
vertically adjustable. The purpose of these head restraints is to help limit
head motion in the event of a rear collision. To properly adjust your head
restraints, lift the head restraint so that it is located directly behind your
head or as close to that position as possible. Refer to the following to
raise and lower the head restraints.
Push or pull the head rests to the
desired position.
Seating and safety restraints
142