The Harmony Defender 360 3-in-1 Convertible Car Seat is the ideal solution for transporting your child. This premium 3-in-1 car seat exceeds the most stringent safety impact testing in the world and is exceptionally comfortable and easy to use. It comes packed with plenty of convenient features. This Harmony Defender 360 3-in-1 Convertible Car Seat converts to both a high back and backless booster. It's the last car seat you will ever need after your child reaches 22 pounds.