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Status Report, Vol. 47, No. 8 | October 25, 2012 Subscribe

Boosters reach milestone: Nearly all new seats provide good belt fit

Fifteen of 17 booster seats introduced in 2012 earn the top rating of BEST BET from the Insurance Institute for Highway Safety, evidence that more than ever, manufacturers are designing seats to provide good safety belt fit for booster-age children.

The improvements mean that BEST BET boosters now outnumber seats in any of the three other categories for the first time since the Institute released its inaugural booster ratings in 2008 (see "Booster seats," Oct. 1, 2008). Boosters are supposed to improve how adult lap and shoulder belts fit children so the belts can properly restrain them in crashes. BEST BET boosters correctly position belts on a typical 4-to-8-year-old child in almost any car, minivan or SUV.

In all, there are 47 BEST BET boosters for 2012. This total includes the latest models, plus older top-rated designs still on the market. Five seats are a GOOD BET, meaning they provide acceptable belt fit in most vehicles. Two boosters are not recommended because they don't provide proper belt fit, and consumers are advised to avoid them.

Federal regulations don't address how a booster should position safety belts. Manufacturers crash test boosters, but these simulations don't tell parents how boosters will fit their children in their vehicles. The Institute launched its ratings program after research showed most boosters weren't doing a good job of fitting safety belts correctly and consistently in a variety of vehicles.

"Booster manufacturers have risen to the Institute's challenge to improve seat design, giving parents more choices than ever when shopping for a booster that will provide a good, safe fit for their children," says Anne McCartt, Institute senior vice president for research.

Using a belt-positioning booster is important for kids who have outgrown harness-equipped child restraints and aren't big enough for adult belts. Children ages 4-8 in boosters are 45 percent less likely to sustain injuries in crashes than kids restrained by belts alone (see "Which booster is best for me?" Dec. 22, 2009). Children who are using improperly fitted belts are at risk of a host of crash injuries known as "seat belt syndrome." These include spine injuries and internal organ injuries. Boosters help by elevating a child into position and guiding the belts for better protection.

No crash tests are conducted as part of the evaluations. The Institute's ratings focus on belt fit. They don't assess how boosters might perform in a crash because safety belts do the main job of protecting children, not boosters. Some manufacturers say their boosters provide enhanced protection in a side crash, but the Institute hasn't evaluated these claims.

To assess belt fit, Institute engineers use a test dummy representing an average-size 6-year-old child. They measure how lap and shoulder belts fit the dummy in each booster under four conditions representing the range of belt configurations in real-world vehicles.

Cosco Top Side and Graco COLORZ boosters

Top-rated boosters don't have to be pricey. The Graco TurboBooster COLORZ (right) is a BEST BET and retails for about $26. The COLORZ is a better choice than the Cosco Top Side (left), a new backless model that is a Check Fit because it doesn't consistently provide good shoulder belt fit. The Top Side sells for about $15.


The Institute evaluates models new to the market each year. Ratings of boosters with designs that carry over into the next model year remain on the list until the seats are discontinued. In all, the latest ratings cover 91 boosters.

Consumers have a variety of styles and a range of price points to pick from. BEST BETs retail for as little as $19 to as much as $300. Among the new BEST BET models, the backless Graco TurboBooster COLORZ sells for about $26, the highback TurboBooster retails for about $50 and the backless Harmony Carpooler starts at about $35.

Dual-use boosters

Boosters come in two main styles: highback and backless. Highbacks have guides to route lap and shoulder belts and can offer some head support. Backless models have lap belt guides but may need a plastic clip to properly position shoulder belts in many vehicles. Some highbacks, called dual-use, can be converted to backless seats. These get two ratings, one for each mode, because belt fit can differ by mode. Consumers should pay attention to each rating and consider how they will use the seats in their vehicles.

Six of the 24 dual-use boosters included in the 2012 ratings earn BEST BET or GOOD BET in both modes. These include two from Harmony Juvenile Products, the Dreamtime and V6 Highback Booster; one from Combi USA Inc., the Kobuk Air-Thru; and three by Graco Children's Products Inc., the TurboBooster, TurboBooster Elite and TurboBooster Safety Surround.

Dual use booster

Three dual-use boosters new for 2012 earn BEST BET: Graco TurboBooster, Harmony V6 and Graco TurboBooster Safety Surround (left to right). They join the Graco TurboBooster Elite and Harmony Dreamtime as top-rated boosters that provide good belt fit when used as highback or backless seats. Another dual-use model, the Combi Kobuk Air-Thru, is a GOOD BET.


Graco now has 10 BEST BETs, and all eight of the boosters Harmony makes are BEST BETs.

"Parents often tell us they want a dual-use booster that's a BEST BET no matter how they use it," McCartt says. "Having more to pick from really simplifies things."

For its dual-use TurboBoosters, Graco revised the instruction manual and relocated the belt clip to the back center of the seat from the side. The change allows the clip to correctly position the shoulder belt, lifting the backless mode rating from Check Fit, in line with the highback rating.

Check Fit seats

The 37 boosters in the Check Fit category may provide good fit for some children in some vehicles, but not as many as a BEST BET or GOOD BET. As with any booster, parents should make sure the lap belt lies flat across their child's upper thighs and the shoulder belt crosses snugly over the middle of the shoulder. If not, try a different seat.

Two boosters in this group are new for 2012, the Evenflo Big Kid Amp High Back and the Cosco Top Side. The Big Kid Amp High Back is a BEST BET in backless mode, but parents will need to check how the belt fits if the seat is used as a highback. In some cases, the Big Kid Amp may position the lap belt too high on the abdomen in highback mode. The seat is made by Evenflo Company Inc. Evenflo discontinued four models that had been not recommended last year (see "Take your pick," Oct. 13, 2011). The company picks up two additional BEST BET designations, earning it six BEST BETs and one GOOD BET for 2012.

Shoulder belt fit is the issue with the Cosco Top Side. The owner's manual atypically instructs installers to route the shoulder belt over the backless booster's lap belt guide instead of under it. This puts the belt too far off the shoulder in one measurement condition and against the neck in another. Some parents might be able to get good shoulder belt fit with the booster, depending on their vehicle setup and the age and size of their child. The Top Side is made by Dorel Juvenile Group Inc., whose brands include Cosco, Eddie Bauer Baby, Maxi-Cosi and Safety 1st. Five of Dorel's boosters are BEST BETs and one is a GOOD BET.


Combination seats like this Britax Frontier 85, a BEST BET in highback mode, can be used as a harness-equipped child restraint in addition to a booster.


Britax Frontier

3-in-1 boosters

The two not recommended boosters — both from Dorel — are older designs first evaluated in 2009 (see "Which booster is best for me?" Dec. 22, 2009). They are the Safety 1st All-in-One and Safety 1st Alpha Omega Elite. These models are 3-in-1s that can be used as rear-facing and forward-facing child restraints with a built-in harness. They can be converted to boosters by removing the harness and using lap and shoulder belts to restrain a child. Although these seats should work well as child restraints, they aren't the best option for boosters because they leave the lap belt too high on the abdomen and the shoulder belt too far out on the shoulder.

"Dorel should redesign the All-in-One and Alpha Omega Elite to improve booster function," McCartt says. "Parents who own these seats should use them with the built-in harness as long as possible, up to Dorel's recommended height and weight limits."

There are better options for consumers who prefer the versatility of a 3-in-1. Four BEST BETs are 3-in-1s. These include the Evenflo Symphony 65 e3 and three models from Diono LLC — the Radian R100, RadianR120 and RadianRXT. Another choice is the Evenflo Symphony 65, which is a GOOD BET.

McCartt points out that manufacturers sometimes use similar names for different seats, or even the same names for new models, so consumers should consult the Institute's website at iihs.org for model numbers, manufacture dates and photos when they shop for a booster.

She advises parents not to be in a hurry to switch to a booster. Kids should ride in harness-equipped child restraints in rear seats as long as possible, up to the height and weight limits of the seats. Many typically accommodate children up to about 65 pounds — and some go higher. When children outgrow child restraints, they should use boosters until adult belts fit properly, usually when a child reaches 4 feet 9 inches and 80 pounds.

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