The Windscoop Ventilating Sail puts an end to hot, stuffy cabins and sleepless nights. The Windscoop is aerodynamically designed to force the slightest breeze down into your cabin to keep you cool and comfortable. All seams are double-stitched to ensure durability and two battens are sewn into place, helping the windscoop to keep its shape. The versatile Windscoop can be hung from a halyard boom or a roller furling sheet and fits any hatch or companion-way up to 4 feet (120 cm) wide. There is nothing to install and since the Windscoop has no tie-downs, once you put it up, it will follow variable wind. Works with most screens. Windscoop is packed in its own protective nylon storage bag. Colors vary.