Safety 1st engineers designed Air Protect™ using next generation testing methods that simulate the most violent types of side impact crashes, those with vehicle intrusion. Using this advanced methodology; Air Protect™ was engineered to defend your child in two vital ways. During a crash, the system immediately shields your child"s head from the impact. In a second layer of defense, Air Protect™ allows air to escape from the headrest: channeling crash energy away from your child, creating more ride down time. It is this double layer of protection that makes Air Protect™ technology unique. The Safety 1st(R) onBoard35 Air Infant Car Seat with Air Protect™ Side Impact Technology brings revolutionary protection to infants all the way from a tiny 4 to a full 35 pounds. Fabric made in USA. 1 in 4 car crashes involving children are side impact collisions. They are by far the deadliest type of collision for children, accounting for 1 in 3 child fatalities; nearly all of which are caused by head trauma. These are frightening facts. Side impact crashes are the deadliest to children, and almost all side crashes involve head injuries. Air Protect™ Revolutionary Side Impact Technology is a Breakthrough system that shields the head and immediately reduces side impact forces through the precise release of air. The air extends a child"s "ride down time" (the time it takes for the body to come to a full stop). The longer the ride down time, the lesser the impact and resulting injuries. Immediately reduces side impact forces through the precise release of air 17% more leg room than most infant car seats Allows kids to ride rear-facing up to 35 lbs. (The American Academy of Pediatrics now recommends that kids ride rear-facing until the age of 2 for safety.) Customizable infant body insert and low harness slots make the seat ideal for preemies as small as 4 lbs. and is adjustable for growing babies Rear-facing 4-35 pounds and up to 32" in