The Diono Radian 3RXT is the original slim-fit 3 across all-in-one convertible car seat, trusted by over a million parents to protect their child from baby to booster seat (5 - 120 lb / 2.2 kg - 54 kg). Lovingly engineered with the famous Diono steel reinforced frame and now rear facing for even longer, expect 10 years of safety from just one car seat. The Radian 3RXT provides safe and comfortable baby positioning thanks to the new 2-in-1 infant positioning liner with integrated newborn baby travel high wedge. The wedge creates a lie-flat travel position, pushing baby up to reduce head slump while helping to keep airways open. As your baby grows, simply remove the wedge to allow the 2-in-1 infant positioning liner to give extra comfort and support. Designed and engineered with complete rear facing protection, so you can keep them in a safe rear facing convertible car seat for longer up to 50 pounds. Then as they transition from rear facing to forward facing booster seat the aluminum reinforced headrest can be adjusted to one of 12 positions for safety up to 57 inches tall. Built with a mechanically engineered, reinforced steel frame, made from automotive grade high strength steel, the radian is always ready to shield and protect. And when your family grows, the slim-fit design will fit 3 across with Diono radian combination in most vehicles without compromising child safety or passenger comfort. Our SuperLATCH system (UAS Compatible) makes installation easy and super secure. As travel car seat experts, Diono have naturally built in super portable features to the Radian 3RXT with original fold for easy transport and storage and steel reinforced cup holder to store essential road trip drinks and snacks. The radian is also aircraft certified (FAA approved), so you can take safety with you wherever you go.