Be Safe Izi Sleep Isofix Base: The combination of superior safety and simple fitting makes the BeSafe Izi Sleep with the Isofix the obvious chioce for prudent parents. The seats's Isofix base provides mechanical anchorage that is very safe and stable while the base's unique indicators show that it has been fitted correctly. Features Adjustable safety leg Easy to click and lock in Approved in accordance Buttons turn green when seat is secured correctly