Cast piston for an internal combustion engine, consisting of an iron-based material

A cast piston for an internal combustion engine, comprising a piston body having a longitudinal axis made of an iron-based material and having a plurality of piston lands separated by a plurality of piston ring grooves, and at least one skirt wall, and including windows in at least one side wall of the piston, the at least one side wall including a piston pin boss having an axis that is perpendicular to the longitudinal axis, and wherein the windows are asymmetric relative to one another and wherein at a bottom, the windows run diagonally upward in a direction of a piston pin axis, all transitions in the windows are rounded, lower edges of the side walls are at least concavely rounded, and the concave rounding has a smaller curvature radius on a pressure side than on a counter-pressure side of the piston body, and wherein the windows have flat top portions that lie in a common plane perpendicular to the longitudinal axis and in line with a bottom edge of a ring belt portion of the piston.