Following in the footsteps of its predecessors e g the award winning aton 2 group 0 test winner in the 62012 stiftung warentest child car seat test the aton 4 adds to the features of the successful aton series the unique safety features e g the height adjustable headrest with integrated harness guides which improve the excellent accident safety of the energy absorbing shell in combination with the crash test proven l sp system even further and new comfort features e g the huge