Volvo 2007 S80 Owner's Manual page 37

Fold down the backrest section of the booster cushion.
Fasten the Velcro strip.
Fold up the booster cushion into the rear seat backrest
NOTE
See also the instructions on the integrated booster cushion.
44
01 Safety
Integrated booster cushion
WARNING
DEATH or SERIOUS INJURY can occur
Follow all instructions on the booster cushion and in the vehicle's owner's manual.
MAKE SURE THE BOOSTER CUSHION IS SECURELY LOCKED BEFORE THE CHILD IS SEATED.
Use this booster cushion only with children who weigh between 33 and 80 lbs (15 and 36 kg) and whose height is
between 38 and 54 in (97 and 137 cm). In Canada, Transport Canada's weight recommendation is 40-80 lbs (18-36
kg).