The Graco Nautilus Car Seat is a 3 in 1 multi mode car seat for children 20 pounds to 100 pounds. This is the last car seat you will need to buy for your child. The Nautilus is ideal for your children from one to ten years old. First, it is an extended 5 point harness seat for children 20 to 65 pounds that features an easy to install system with a lock off buckle for easy secure installation. Second, it works as a high back booster for children 30 pounds to 100 pounds, and finally as a backless booster for children 40 pounds to 100 pounds. The Nautilus Car Seat has a steel reinforced frame for durability, and has a 3 position recline for proper installation and comfort. The car seat offers easy access storage and cup holders for your childand#8217;s enjoyment. Nautilus transforms into three modes to go the distance.