<p>Rainproof jacket, particularly for riders, including a back panel having a ventilation window which runs over its major portion. A rain protection flap fully covers this ventilation opening. The upper edge of the flap is secured to the upper end of the back panel while the lower edge of the flap is releasably secured to the lower end of the back panel. The lateral edges of the flap are unattached, that is they remain free of the back panel and of the ventilation window so that air is allowed to freely circulate between the ventilation window and the rain protection flap.</p>
