Jane XTend Impact Shield: Technically known as an impact shield, XTend is a protective cushion that effectively operates as a child retention system. The easy to use accessory means that children of between 9-18kg (group 1) can safely travel in seats that are designed for group 2 and 3. Essentially, by adding the XTend to either Montecarlo model, the car seat can be used for children from 9-36kg in weight (approx. 9 months to 12 years). XTend compatible with the Jane Montecarlo, Montecarlo Plus, Montecarlo R1Indy, Momo & Momo Plus. Manufactured from Expanded Polystyrene, XTend is lightweight but also highly energy absorbent. Extra ventilation windows also allow your child to feel comfortable and fresh while travelling. Please Note: Car seat is not included.