Set Includes All-in-one convertible car seat Features Designed to fit 3 across in a mid-size vehicle and offers more shoulder space, without sacrificing safety or passenger comfort Designed and engineered with complete rear-facing protection for up to 50 lbs. (approx. 4 years old) Built with a mechanically engineered, reinforced steel core, made from automotive-grade high strength steel, the radian is always ready to shield and protect Original fold for easy transport and storage Steel reinforce Diono Radian 3RXT Original 3 Across All in One Car Seat-Kids