The fixing is done by two rods that can be extend from the seat and snap into the Isofix mountings of the vehicle at the end. The seat is firmly anchored, a troublesome attachment deleted by belt. The child is then strapped directly to the 3-point harness.
The promise that the seat improved by adequate air flow and suitable materials the seat climate corresponds to the facts. Our son who is very prone to sweating, now increases regularly with dry back of the child seat. Previously his T-shirt was soaked in sweat back often!
The only drawback: The seat is very steep in the back seat of our A-Class (W169). If the child is asleep and you have to brake sharply, lands his head with his chin on his chest.
To protect the part leather seat we bought a padded leatherette pad by Recaro in the local Baby-One. These acts of high quality and in accordance with the task.