The Infa Secure Vario II Create Booster Seat is made for children between 4 and 8 years old. It uses an adult lap-sash belt and features a top tether for simple installation. Integrated Air Cocoon Technology Higher backrest Higher shoulder height markers Redesigned, larger seat belt/sash guide slots Adjustable headrest Anti-submarining feature Side-impact protection Covers made of soft fabrics Machine washable Air Cocoon Technology The Vario II features Air Cocoon Technology (A.C.T.) that enhances side-impact protection through its blow moulding design, which dramatically reduces the impact forces during a crash. The headrest’s side wings act like airbags. As a result, this reduces the forces on your child’s head during a side-impact accident. Anti-submarining feature Submarining is caused by the seat belt lifting and the child sliding under the lap belt in an impact. The anti-submarining feature helps to prevent this with the armrest’s unique design that holds the lap belt firm and secure across the child’s lap. Correct fit, every time Maintaining the correct fit is easy with the extendable headrest with integrated sash guides. The headrest easily adjusts to suit your growing child, without needing to uninstall the seat. The large seat base is also great for accommodating larger children. It also features a narrow external width, perfect for 3 across installations.