Chevrolet 1999 Tahoe Owner's Manual page 55

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A booster seat (F, G) is designed for children
who are about 40 to 60 lbs., or even up to 80 lbs.
(18 to 27 kg, or even up to 36 kg), and about four
to eight years of age. A booster seat is designed to
improve the fit of the vehicle's safety belt system.
Booster seats with shields use lap-only belts;
however, booster seats without shields use
lap-shoulder belts. Booster seats can also help a
child to see out the window.
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