3 modes of use: rear-facing 5-35 pounds. Forward-facing 22-40 pounds. Booster mode 40-100 pounds. Quickfit harness system: adjust harness height from the front in one easy step. Side impact protection, 3-position recline, adjusts with one hand. Removable infant head support pillow. Epp energy absorbing foam. Rotating arm rests. Detachable cup holder. 5-point harness with up-front adjustment.