Maxi-Cosi Topaz i-Size Highback Booster in Full GraphiteUnfold, Buckle Up & Go Finding a booster seat that combines convenience, long term safety, and sustainability is a big win for any family. Meet the Maxi Cosi Topaz i Size in Full Graphite, the compact, folding highback booster designed to grow with your child from 3. 5 years to 12 years old. Engineered with G CELL Side Impact Protection, eco conscious materials, and a space saving foldable design, this seat makes car rides safer and easier for both