Many boosters use arm rests to do this. See here for a very in-depth discussion of exactly how and why boosters work so well for children. For kids who like to sleep in the car, choose a high-back booster that has a recline and a well designed head rest. These design aspects can help the child sleep better and longer while keeping their body better positioned in the seat belt during sleep. One high back booster we find that is especially good for sleeping is the Maxi Cosi RodiFix.
If the seat back is not tall enough, then the child needs a high back booster. Do you see the error here? Studies show that nearly half of all boosters are misused in the same way, where the lap belt is accidentally placed over one or both of the arm rests.
Some boosters are cleverly designed to eliminate this type of misuse! Data has shown that boosters reduce the risk of injury for children aged 4 to 8 years by 45 percent versus children of a similar age that are restrained using the vehicle belts alone. See our car seat timeline and buying advice to figure out which seat is best for your child, no matter the age.
Many backless boosters do a decent job of positioning the lap belt on a child's hips. But in vehicles where the upper belt anchors don't fall exactly in line with the child's shoulder, backless boosters are less likely to provide a good fit.
High-back boosters have upper back guides that, in most cases, position the shoulder belt properly and keep it in place. This is especially important when a youngster moves around a lot, and in vehicles where the shoulder belt anchors are positioned too close or far from the child's shoulder. See our video on how to install and use both harnessed and belt-positioning booster seats. Some backless boosters do include a clip that helps position the shoulder belt.
In our fit-to-child evaluations, we find that these clips do a decent job of positioning the shoulder belt if everything is kept still, but when we move our child dummy to simulate a child moving, the belts easily slip out of place on the shoulder. The flexible strap attached to the clip simply can't hold it in place. A high-back booster also provides head support that backless boosters do not.
This is especially important if your vehicle doesn't have headrests in the rear seat, or if the headrests are not tall enough to protect your child's head when the booster is in place. The instructions included with most backless boosters prohibit their use in vehicle seating positions where the child's ears or the mid-point of the child's head would be above the vehicle seat back or head restraint. Most high-back boosters provide that protection even for vehicles seats that lack a head restraint.
High-back boosters also provide head protection from the side, as well as the convenience of a spot for a sleeping child to rest their head. The three main types include high back booster seats, combination harness-to-booster seats and backless boosters. As with any type of car seat, the best type of booster seat is one that provides the best fit for your child, keeps them properly restrained and can be used correctly in your car.
A backless booster should only be used in a car with headrests. There are a few advantages to backless booster seats. Crash test studies have shown that the side-impact protection of a high back booster seat significantly reduces the risk of whiplash and other injuries when used properly. This makes a high back booster a better choice for younger or smaller children who still require a belt-positioning booster seat but need the added head support.
You can also check out this guide from Consumer Reports to confirm a booster seat fit. High back booster seats act much more like a hybrid model between a traditional backless booster seat and a car seat. High back booster seats have an extended back, which makes them look like a car seat.
This back is often removable so that the seat acts like a traditional backless booster seat. Many manufacturers include five-point harnesses so that parents can quickly graduate from a car seat to a high back booster seat with a seat belt. These booster seats tend to be much safer when it comes to a side-impact crash. High back booster seats are useful for children who like to sleep a lot in the car.
The high back will prevent them from slumping, keeping them upright and giving them something onto which they can rest their head. There are some negatives, however, when it comes to high back booster seats. The first is the weight and bulkiness. High back booster seats tend to operate much more like car seats, which means it can be challenging to remove them from a vehicle.
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