A sail having at least three tops and three corresponding edges opposite the tops and comprising a plurality of panels each of which in turn comprises two outer covering layers, between which a plurality of reinforcement elements are positioned which define, in their entirety, a multi-directional main reinforcement structure. The plurality of reinforcement elements are disposed in a pre-determined manner with respect to three generatrix lines, which have in common a determinate reference point, disposed in a substantially central position of the sail and each one passing through, or near, one of the three tops.