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A harnessed seat has an internal 5-point harness system to restrain the child, whereas a booster seat “boosts” the child up so that the vehicle seat belt is positioned correctly across the child’s hips and shoulder/middle of the chest.
The minimum requirement is set to avoid promoting forward-facing too early. It’s recommended to transition from an infant car seat to a rear-facing convertible car seat before using a harness-2-booster.
Your child must weigh at least 40 lbs, at least 44” tall, and be mature enough to sit still and upright for the whole ride. Check your car seat manual for any additional requirements.
Best practice states that children are usually ready for belt-positioning booster mode when they outgrow the height or weight limit of their forward-facing harness—typically around 65 lbs or 49 inches tall.
The seat belt should:
Your child should be able to:
Your child can ride without a belt-positioning booster when the vehicle’s seat belt fits correctly without the booster—usually around 4'9" tall and between 8–12 years old.
The ISOFLEX system secures the booster seat to the vehicle, preventing it from becoming a projectile when not in use and stabilizing it during a crash.
The lower connectors secure the booster seat to the vehicle, preventing it from becoming a projectile when unoccupied and providing stability during a crash.
In booster mode, the vehicle seat belt restrains the child, and the LATCH system provides stability to the seat. The LATCH does not bear the crash forces, so it does not contradict the vehicle manufacturer’s maximum anchor weight limit.
No, the seat should not be reclined in booster mode as it was tested and certified for use only in the upright position.
Use with the backrest for children who weigh between 40 and 120 lbs. (18.1 and 54.4 kg) and whose height is between 44 and 63 in (111.8 and 160 cm).
Use without the backrest for children who weigh between 48 and 120 lbs. (21.8 and 54.4 kg) and whose height is between 46 and 63 in (116.8 and 160 cm).
Use the Skyline/Highpoint as a backless booster only in seating positions with a vehicle head restraint and when proper vehicle belt placement can be achieved.
Britax recommends that you secure the booster seat to the vehicle using the lower connectors or by fastening the vehicle seat belt across the unoccupied booster seat. This helps position the seat for use and reduces the chances of the booster becoming a projectile when not in use.
Britax strongly recommends that children be restrained in the rear seating positions, as it is statistically safer.
To help ensure the vehicle seat belt is properly positioned when using the Skyline/Highpoint, the lap belt should be worn underneath the armrest and rest low on the child’s upper thighs (pelvis area) to keep it securely in place. The shoulder belt should cross the midpoint of the child's chest, rest snugly on the shoulder while avoiding the neck, and sit under the armrest on the buckle side. This positioning will help ensure that both the lap and shoulder belts provide optimal protection in the event of a crash.
Secure the booster seat to the vehicle using the lower connectors or by fastening the vehicle seat belt across the unoccupied booster seat.
Discontinue use of the booster seat if it is older than ten (10) years from the date of manufacture or has been involved in a severe crash.
Verify that the child restraint and child restraint belts or straps do not interfere with the opening and closing of the vehicle door. Consult the vehicle user guide to help ensure proper installation.
Do not use anything to raise the booster seat off the vehicle seat, as this could cause the booster seat not to perform as intended in a crash.