The Diono Radian® 3RX is the original slim fit 3 across all-in-one convertible car seat, designed to protect from baby to booster seat (5 – 120 pounds). 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® 3RX features an infant head and body support for extra comfort that is easily removed as your infant transitions between rear and forward facing. 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.