A sail body (3), which can be finished along its edges and corners to create a finished sail (2), includes a number of sail sections(46) joined along their edges (47). Each sail section includes a reinforced material (20) laminated between first and second films (32,42). The reinforced material includes sectors of reinforced material (30,31), each sector having a set of generally parallel reinforcement elements (24), such as fibers. The sectors of reinforced material are preferably elongate sectors in which at least the majority of the sectors have lengths (34) at least five times as long their widths (36). The sectors are arranged in an overlapping pattern and so that the set of reinforcement elements are generally aligned with the expected load lines (28)for that section of the sail body. Sections can be made of different shapes but are typically triangular or quadrilateral. The reinforce material is typically a mesh or scrim containing sets of parallel, transversely oriented fibers (24,26). The mesh or scrim can either woven or unwoven.