Description: Designed and engineered to keep your child rear facing even longer up to 50 lb, approx. 4 years old with the Diono Radian 3R. 10 YEARS ONE CAR SEAT - With 4 ways to travel from birth to booster, the Radian 3R adapts as your child grows to offer a custom fit from birth up to 120 lb. STEEL CORE - The Diono Radian 3R has a mechanically engineered, reinforced steel core, made from automotive grade high strength steel to shield and protect. Elevates All-in-One convertible car seats to a more upright position with the Diono Angle Adjuster so they can fit in smaller vehicles. DENSE & DURABLE - The Diono Angle Adjuster is made with a high-density foam that will not flatten under the weight of the car seat.