male undergarment with front opening bounded by two edges (2)2) and characterised by the fact of understanding in correspondence with the front section of the seat belt (4) two straps (6, 6 ') for the support of independent these flaps (2, 2').at least one of which is sliding along the respective tape roll, between a position in which the two flaps are among them at least partially overlapping and a position.they are mutually spaced
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