Booster -

The shoulder belt passes through the guide on the headrest, ensuring it lays flat across the chest, not the neck.

As the child grows older (typically around 4 feet 9 inches tall, or ages 8-12), the backrest is removed to leave only the bottom seat, providing the final boost required to fit the vehicle’s seat belt perfectly. Attaching the Back to Graco® TurboBooster® booster

The child sits in the seat, and the vehicle's lap-and-shoulder belt is used. The shoulder belt passes through the guide on

The lap belt passes under the booster seat armrests, keeping it secure over the child's thighs. or ages 8-12)

A quick check of the instruction manual ensures all armrests and fabrics are secure.