Chevrolet 2005 SSR Pickup Owner's Manual page 32

A booster seat (F-G) is a child restraint designed to
improve the fit of the vehicle's safety belt system. Some
booster seats have a shoulder belt positioner, and
some high-back booster seats have a five-point harness.
A booster seat can also help a child to see out the
window.
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Q:
How do child restraints work?
A:
A child restraint system is any device designed for
use in a motor vehicle to restrain, seat, or position
children. A built-in child restraint system is a
permanent part of the motor vehicle. An add-on
child restraint system is a portable one, which
is purchased by the vehicle's owner.
For many years, add-on child restraints have
used the adult belt system in the vehicle. To help
reduce the chance of injury, the child also has to
be secured within the restraint. The vehicle's
belt system secures the add-on child restraint in the
vehicle, and the add-on child restraint's harness
system holds the child in place within the restraint.
One system, the three-point harness, has straps
that come down over each of the infant's shoulders
and buckle together at the crotch. The five-point
harness system has two shoulder straps,
two hip straps and a crotch strap. A shield may
take the place of hip straps. A T-shaped shield
has shoulder straps that are attached to a flat
pad which rests low against the child's body.
A shelf- or armrest-type shield has straps that are
attached to a wide, shelf-like shield that swings
up or to the side.