The Nuna AACE Booster Car Seat makes it easy to keep your growing child safe. Its innovative design is streamlined and customizable for comfort, security and a sleek style. Safety is a top priority with energy absorbing foam and SIP pods, colored belt path indicators and easily-connected lower anchor connectors. This travel-friendly booster seat also offers some pretty cool features like the 3D Growth System with three components: Grow Up provides a one-hand, 9-position height-adjustable headrest; Grow Out offers a shoulder system that works simultaneously with the headrest, expanding out while growing up; and Grow On provides 3 depths, giving growing legs plenty of support and space. Kids can ride in comfort thanks to the removable, 8-position backrest and breathable ventilation panels. And you’ll love the sleek and washable micro-knit fabric that will make maintenance a breeze.