The original 3-across all-in-one car seat upgraded. With 12 improvements from the original Radian 3R, 3R Safeplus features Diono Safeplus engineering, Safeplus easy-adjust 12 position headrest, and improved Safeplus side impact protection for complete protection from birth to booster now suitable from 4 - 120 lb, 1.8 - 54 kilogram.