Its streamlined, customizable and as beautiful as a booster seat gets. AACE grows comfortably with your child and even converts to a no back booster. It also exceeds American safety standards the only thing about it thats overdone. Join the grow-volution. 3D growth system Grow upone-hand, 9 position height adjustable headrest Grow outshoulder system works simultaneously with the headrest, expanding out while growing up Grow onseat sports 3 depths giving growing legs plenty of support and space 2-in-1 design Converts from a high back to a no back booster Secure : Energy absorbing foam and SIP pods take side impact security to the next level Belt positioner aids in correct shoulder belt routing and minimizes user error Colored belt path indicators help decrease risk of user error Lower anchor connectors easily secure car seat to vehicle seat during use or transport Comfortable Customizable recline thanks to 8 different positions (in high back mode only when using lower anchor connectors) Ventilation panels within the shell and breathable (and washable!) knit fabric create a comfy climate for even the longest of trips Little arms can take a break thanks to cozy, built-in armrests sleek : Sleek and chic micro-knit fabric is easy to remove and machine washable Included cup holder is removable and dishwasher safe Accessories : AACE starter kit includes a cup holder, belt positioning clip & a set of LATCH guides (included with purchase) Specifications: Weight: 15.6 lbs Dimensions: 22.5 H x 14.5 L x 12 W High Back Booster: Recommended child weight: 40110 lbs Recommended child height: 3860 in Suggested age: 4 years and up No Back Booster: Recommended child weight: 50120 lbs Recommended child height: 3860 in