The Maxi-Cosi Topaz i-Size in Full Graohite is the compact folding multi-age booster seat that’s easy to carry, easy to store, and easy to switch between cars. Designed to withstand years of use, it grows alongside your child from 3.5 years up to 12 years old (100 – 150 cm). Topaz i-Size is there to reliably protect your child through adventures, big or small.