Finally, the car seat that parents have been searching for is here! Our Nautilus 3-in-1 car seat helps keep your child secure from 22 to 100 lbs. Nautilus is a 3-in-1 car seat that converts from a harnessed booster to a high back belt-positioning booster and finally to a backless belt positioning booster. The harness booster can be used up to 65lbs, and as your little one continues to grow, the Nautilus does too, transitioning into a Highback belt positioning booster which can be used from 30 – 100lbs, and finally into a Backless belt positioning booster for a comfortable fit from 40 to 100 lbs. The seat is designed to help keep your child in a harness booster longer as well as to fit them up to 57″ tall. You can easily see Graco’s commitment to safety as this seat is extensively crash tested to meet or exceed U.S safety standards, side-impact testing, and outfitted with reinforced steel for effective energy management. Nautilus has been thoughtfully designed with plush comfort features, an integrated cup holder and storage compartments, as well as a one-hand height adjustable headrest to help keep your growing child happy on even the longest rides! This 3-in-1 car seat is will last your little travel companion well into childhood.3-in-1 harness booster helps protect your child from toddler to youth.