The NextFit Max Zip Air Convertible Car Seat offers more legroom and a 50 lb. weight limit to comfortably extend use in the rear-facing position. It offers upgraded features like a 3D AirMesh backrest for enhanced airflow and a zip-off, machine washable seat pad for easy care. For premium protection, DuoGuard features a deep rigid shell and EPS energy-absorbing foam that surrounds the head and torso. The seat shell is also reinforced with a steel frame for superior impact protection.