Introducing the luxury 3 across All-in-One Car Seat for first class travel from birth to booster suitable from 4 - 120 lb. Diono Radian 3QXT FirstClass SafePlus features SafePlus engineering, exclusive premium fashion and SafePlus 2-in-1 anti-rebound panel and adjustable calf support for the very best in safety, comfort and style. The SafePlus 2-in-1 anti rebound panel and adjustable calf support features 4 positions and can be easily adjusted as your child transitions from rear-facing to forward facing. When rear-facing the anti-rebound panel increases stability and reduces rebound rotation by up to 50% for extended rear-facing travel up to 50 lb approx. 4 years old. Then as they transition to forward facing the panel can be set in multiple positions to provide convenient calf support. The comfort liner included is then positioned on top of the calf support for additional child comfort. From baby's first journey the Diono Radian 3QXT FirstClass SafePlus All-in-One Convertible Car Seat provides complete newborn protection, with SafePlus newborn travel high wedge, SafePlus newborn protection insert, SafePlus 2-in-1 infant positioning liner and SafePlus newborn harness pads to provide a custom fit from birth. Engineered with 8 layers of side impact protection that includes a removable SafePlus side impact management pod, constructed to channel energy around the back of the car seat and away from the child in the event of a side impact. This forms two of the 8 layers of side impact protection without compromising 3 across fit in most midsize vehicles. As they transition to forward facing, the SafePlus easy adjust 12 position headrest is contoured to improve child head containment. All these great features have been combined with SafePlus engineering, with the Radian 3QXT FirstClass SafePlus All-in-One Convertible Car Seat subjected to a combination of the most rigorous crash tests, front, rear, and side impacts, and rollover test to ensure the safest seat possible. Parents can also expect the travel friendly traits Diono is famous for, including convenient fold and FAA approval for use on an aircraft. So, no matter where you go you can take Diono safety with you.