Toyota 2015 Prius Owner's Manual page 131

1-4. Adjustable components (seats, mirrors, steering wheel)
Installing the head restraints
■
Front and rear center seats
Rear outside seats
Adjusting the height of the head restraints
■
Adjusting the rear center seat head restraint
■
Always raise the head restraint one level from the stowed position when
using.
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Align the head restraint with the installa-
tion holes and push it down to the lock
position.
Lock
Press and hold the lock release button
release
when lowering the head restraint.
button
Align the head restraint with the installa-
tion holes and push it down to the lowest
lock position.
Make sure that the head restraints are
adjusted so that the center of the head
restraint is closest to the top of your ears.