re-test the technology. and they tested about 35-mile-per-hour crashes or stops to see how they perform. and these are the top performers. also, giving points for easy of use because so many install their seats incorrectly. being able to install a seat correctly is half the battle. let s start down here at the end. this is the one we had in our house. the chicco keyfit keeps the stop spot with a one pull latch system so that you can really get it securely in place, even if you are a small person or don t feel like you are physically strong. on the back here, just pull this thing up and it pops out. you can get that seat in correctly and performs well in crash tests. the keyfit is still number one rated. and the number two. this is a smaller seat, the combi shuttle. it has a rebound bar. the latch system is keeping the car seat from flying this way,