What must be used with a booster seat for toddlers?

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A booster seat is designed to help secure a toddler safely in a vehicle by elevating them to the proper height for the vehicle's seat belt system to function effectively. To ensure maximum safety, it must be used in combination with a tethered harness or shoulder straps, which provide extra security and protection during a crash. These restraints are essential because they help to keep the child properly positioned in the seat, preventing excessive movement and reducing the risk of injury in the event of sudden stops or collisions.

In contrast, using just a lap blanket does not offer any protective measures or security. A bicycle helmet is designed for riding bicycles, not for vehicle safety, making it irrelevant when discussing car seating arrangements. Lastly, claiming that no other equipment is necessary undermines the importance of utilizing proper safety measures that are crucial for protecting a young child while traveling in a car. Therefore, the inclusion of a tethered harness or shoulder straps with a booster seat is integral to ensuring the child's safety.