The XXL USF50+ sunshade provides shade, and the height-adjustable headrest can be individually adjusted to suit your growing child. The linear side impact protection safeguards in the event of a side collision. While the Base M offers additional protection and stability, it is also compatible with the Sirona M2 i-Size as your baby grows. The Aton B i-Size is easy to handle outside the car, weighing only 3.9 kg, and can be combined with Cybex or gb strollers. Ready to use from day one: The removable newborn insert of the infant car seat allows even the smallest passenger to lie in an ergonomically optimized position.