The original All-in-One convertible car seat is designed to fit 3 across and with our famous steel core inside for optimum safety. Now rear-facing for even longer up to 50 lb/ 22.7 kg and suitable from birth up to 120 lb/ 54 kg, expect 10 years of safety from just one car seat. Designed and engineered with complete rear-facing protection, Radian 3R will keep now your precious cargo rear facing for even longer up to 50 lb/ 22.7kg, approx. 4 years old. Built with a mechanically engineered, reinforced steel core, made from automotive-grade high-strength steel, the Radian 3R is always ready to shield and protect. And when your family grows, the slim fit design will fit 3 across in most vehicles without compromising child safety or passenger comfort. As travel experts, Diono has naturally built-in super portable features to the Radian 3R with original fold for easy transport and storage and steel reinforced cup holders to store essential road trip drinks and snacks. The Radian 3R is also aircraft certified FAA approved, so you can take safety with you wherever you go.