Lincoln MKS Owner's Manual page 21

Types of Booster Seats
If your backless booster seat has a removable shield, remove the shield.
If a vehicle seating position has a low seat back or no head restraint, a
backless booster seat may place your child's head (as measured at the
tops of the ears) above the top of the seat. In this case, move the
backless booster to another seating position with a higher seat back or
head restraint and lap/shoulder belts, or consider using a high back
booster seat.
If, with a backless booster seat, you cannot find a seating position that
adequately supports your child's head, a high back booster seat would be
a better choice.
Children and booster seats vary in size and shape. Choose a booster that
keeps the lap belt low and snug across the hips, never up across the
stomach, and lets you adjust the shoulder belt to cross the chest and
rest snugly near the center of the shoulder. The following drawings
compare the ideal fit (center) to a shoulder belt uncomfortably close to
the neck and a shoulder belt that could slip off the shoulder. The
drawings also show how the lap belt should be low and snug across the
child's hips.
2013 MKS (mks)
Owners Guide gf, 2nd Printing
USA (fus)
Child Safety
• Backless booster seats
• High back booster seats
21