Perfect underpants. (Machine-translation by Google Translate, not legally binding)

摘要

An improved underpants characterized by the fact that the rear center seam is eliminated in them, having for this purpose a rear center piece that includes the entire height of the underpants from the waistband to the inner, lower edge of the tubes for the passage of the legs; laterally moving, therefore, their seams of union with the rest of the pieces of the underpants, and thus not coinciding with the entire spinal and anal region. (Machine-translation by Google Translate, not legally binding)