InfaSecure Vario ll Go (4 to 8 Years)The Vario II Go is a Booster Seat for children between 4 and 8 years old. It uses an adult lap & sash belt, and features a top tether for simple installation. Secur air Secur air works hand in hand with Air Cocoon Technology (A. C. T) to dramatically reduce crash energy to the childs head. Vario II comes with A. C. T as a standard feature, which alone reduces crash energy to the child more than five times lower than the level required by the 2013