Britax FRONTIER 85 User Manual

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Harness Mode:
Children must:
be at least two years of age 
and
weigh between 25 – 85 lbs (11.4 – 38.6 kg) 
and
stand 30 – 57 in. (76.2 – 144.8 cm) in height 
and
WARNING!
 Harness mode use of this child seat is ONLY 
for children who meet ALL of the following requirements. If the 
child does not meet all harness mode requirements because 
the child is too small, another type of child seat MUST be used. 
If  your  child  does  not  meet  all  harness  mode  requirements 
because they are too large, you may need to use this child 
seat in booster modeThoroughly review all fit requirements 
before using the child seat.
WARNING!
 Booster  mode  use of this child seat is ONLY for 
children who meet ALL of the following requirements. Use only the 
vehicle’s lap and shoulder belt to secure the child. If the child does not 
meet all booster mode requirements because the child is too small, 
you  may  need  to  use  this  child  seat  in  harness  modeThoroughly 
review all fit requirements before using the child seat. 
Children must:
be at least 40 – 120 lbs (18.2 – 54.5 kg) 
and
stand 42 – 65 in. (106.7 – 165.1 cm) in height 
and
the top of the child’s ears must be below the top of the head 
restraint 
and
the vehicle belt must be appropriately positioned at or above 
the child’s shoulder through the shoulder belt guide.
Shoulder level
Above Shoulder Level
Below Shoulder Level
NOTE: Britax recommends booster mode only after the child 
outgrows harness mode.
the top of the child’s 
ears must be below the 
top of the head restraint 
when seated 
and
the harness straps must 
be located at or above 
the child’s shoulders 
when seated.
Booster Mode:
Child Seat Fit Requirements
Child Seat Fit Requirements