The Diono Radian® 3R is the original slim fit 3 across all-in-one 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. Designed and engineered with complete rear-facing protection, so you can keep them in a rear-facing convertible car seat for longer, up to 50 pounds.