27 to corresponding anchors 31 each batten strap 30 stretches the sail 18 over the corresponding batten 28 when a batten loop patch 32 fastened to the batten strap 30 is engaged with a batten hook patch 33 fastened to the batten pocket 29 each batten pocket 29 and a corresponding pocket extension 34 of the main section 25 extends to a point proximate to the corresponding anchor 31 for guiding the batten 28 into engagement with the anchor 31 an anchor strap 35 fastened to the pocket extension 34 secures the batten pocket 29 with the pocket extension 34 to the anchor 31 through a strap slot 36 in the anchor 31 an anchor loop patch 37 fastened to the anchor strap 35 engages an anchor hook patch 38 fastened to the batten pocket 29 in front of the mast 10 within the sock 26 of the sail is located a leading edge member 39 the leading edge member 39 can be interrupted to form a head leading edge member 39a and a foot leading edge member 39b with space between for fastening a conventional yoke not shown to the mast 10 the head leading edge member 39a is retained axially within the sock 26 by the boot pin 23 the foot leading edge member 39b is retained axially within the sock 26 by a foot pin.