FORD 2013 Flex v.4 - Manual (Page 24)

If the booster seat slides on the vehicle seat upon which it is being used,
placing a rubberized mesh sold as shelf or carpet liner under the booster
seat may improve this condition. Do not introduce any item thicker than
this under the booster seat. Check with the booster seat manufacturer’s
instructions.
INSTALLING CHILD SEATS
Using Lap and Shoulder Belts
WARNING: Airbags can kill or injure a child in a child seat.
NEVER place a rear-facing child seat in front of an active airbag.
If you must use a forward-facing child seat in the front seat, move the
seat all the way back.
WARNING: Children 12 and under should be properly restrained
in the rear seat whenever possible.
Child Safety 23
2013 Flex (471)
Owners Guide gf, 4th Printing, December 2012
USA (fus)