The Infa Secure Aspire Premium is a Booster Seat suitable for children aged between approximately 4 and 8-years-old. Aspire Premium features an adjustable, locking headrest which enables the seat to grow with your child. This child restraint uses the vehicles adult lap & sash belt. It also features a top tether strap for simple installation and is the tallest Booster Seat on the Australian market, seating children up to a seated shoulder height of 57cm. T) & Secur-air. Secur-air works hand in hand with Air Cocoon Technology (A.C. T) to dramatically reduce crash energy to the child's head. The Aspire Premium 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 Australian Standard and with the addition of Secur-air, your restraint gains a third layer of protection for your child's head. The Aspire Premium features Active Bamboo covers. Active Bamboo is a high performance, premium quality bamboo charcoal fabric. The gently woven yarn wicks away moisture, keeping your child cool and dry whilst offering a soft, smooth surface ensuring your child travels in complete comfort.