From cute pre-schooler to independent pre-teen is the longest and shortest time, and Nuna AACE grows right along with your child. Car safety gets a lot of attention with younger kids, but the Nuna AACE solves for the many years beyond that. This sleek and comfy seat offers a nine position adjustable headrest, a shoulder system that works simultaneously with the headrest (a unique feature) and a seat with three depths that gives growing legs plenty of space. Two reasons it's so safe: energy absorbing foam and side impact protection pods. AACE is extra comfy too, thanks to eight recline positions, ventilation panels within the shell and breathable, washable knit fabric. AACE securely attaches with lower anchors that work in your own car and when traveling. And fortunately for kids who may not love the idea of riding in a car seat, it feels more like a sleek chair with a seatbelt. There's a belt positioner that helps with correct shoulder belt routing, along with colored belt path indicators. From the fabric to the foam and beyond, each element is smartly sourced to be flame resistant with no added fire retardant chemicals. AACE converts from a high back booster (40 lbs to 110 lbs) to a no back booster (50 lbs to 120 lbs).