Get Upto 31% Discount On Travel Systems At Amazon.com. The Affix Backless Youth Booster Car Seat features the Latch system, which stays secured to the vehicles seat, for easy self-buckling . Give the "Big Kid" a boost with this seat, designed to help keep kids from 40 to 100 pounds, from 40 to 57 inches tall, and from 4 to 10 years old safe while riding in a vehicle. One will love the Latch system on the Affix Backless Youth Booster, which allows one to secure the booster firmly to the seat simply and easily. With just one hand, one can create a secure connection using the vehicles anchors to keep the booster properly in place. Once the seat is properly secured to the vehicles seat with the Latch system, it is easier for the independent little one to self-buckle. Kids love to feel grown up, so they especially love this feature.