Method of applying slides (1) in the edge of a sail and corresponding device. An extruded rod is cut into plugs (5) of slide length and are applied at intervals from each other along a straight line on the sail material (2), which is then folded along the line and is sewn with at least one seam to enclose the slides (1) in the material (2). The material (2) can be a portion of the sail itself or a separate strip which is then sewn onto either side of the edge of the sail.
