Gives your child the "boost" they need to ride safely using just the vehicle seat belt. Easily converts from high back to backless booster. This 2-stage belt-positioning booster seat pairs superior safety with a stylish design. It easily converts from a high back booster to a backless booster, so your child rides safer, longer. 3 Layers of Side Impact Protection include an energy-absorbing shell, foam-lined headrest and side cushions that surround the head, neck, and torso. Color-coded belt guides and the SecureGuard clip help you quickly and easily position the vehicle seat belt. The 10-position, quick-adjust headrest grows with your child up to 63", and 2 dishwasher-safe cupholders keep drinks & snacks within reach. With plush, foam padding & built-in arm rests, your big kid will love the ride. And, this seat conveniently fits 3-across in most vehicles, while still providing spacious comfort.