The Big Kid LX booster car seats offer a 2-in-1 design that allows them to transition from a high-back booster car seat to a no-back booster car seat. The one-hand full body adjustment allows the seat to be positioned at 6 different heights for a correct fit. Along with the pivoting armrests, the dual cup holders will keep drinks and snacks close. Give your child the comfort and protection they deserve with Evenflo booster car seats. Appropriate for children 3 years and older. Protecting children is our core mission at Evenflo. For almost a century we have been a leader in safety, innovation and education. Knowing that one in four automobile accidents are side impact collisions, we believe it"s important to go beyond the current government standards when designing the next generation of Evenflo car seats, including the Big Kid LX .