BRITAX Parkway SGL offers advanced protection to children and reduces risk of injury for others in vehicle - A new belt-positioning booster seat from BRITAX-the ParkwayR SGL-introduces the ISOFLEXTM Flexible Lower LATCH Connection System. The ISOFLEX system secures the booster seat to the vehicle in seconds with only two clicks and a pull, which stabilizes it during a crash and prevents it from becoming a projectile when not in use. The Parkway SGL can be easily converted into a backless booster, and accommodates children 40 pounds and 38 inches up to 120 pounds and 63 inches.