The Graco Maxi i-Size R129 Highback Booster Seat combines safety, comfort and practicality for growing children. Buy online at Halfords today. This forward-facing high back booster seat is R129 certified and features a 10-position adjustable headrest, padded seat, and two built-in cup holders. Lightweight and easy to transfer between vehicles, it also has machine-washable covers for simple cleaning. A reliable and comfortable car booster seat, ideal for everyday use and long journeys.