Vest-shaped harness that is specially designed for use in men, as it incorporates a perineal piece, and is suitable for patients with anterolateral instabilities, to be adapted to the wheelchair or other chairs or armchairs. It is made of a semi-rigid breathable three-layer material made of polyamide, foam and polyester, with regulation and fastening straps with closing buckles identified by a colour code to make it easier to put on. It consists of an abdominal belt attached to a bib with shoulder straps and perineal girth, at the ends of which there is a ratier girth with a pin and a fastening system that allows regulating the desired fastening. Size 1 corresponds to a total contour of the person in the chair or armchair of 79-168cm.