The WindPaddle Adventure Sail is a self-launching, self-standing sail for kayaks, canoes. sit-on-tops, paddle boards, and other small watercraft. The WindHarness (patent pending) allows you to quickly attach your WindPaddle onto any boat or switch between boats in seconds. If your boat has anything that can be clipped to - including deck lines, cleats, bungees, pad eyes, fairleads, thwarts, handholds on the gunwale or bench seat - you can probably attach your WindPaddle to it! Deployed diameter - 42" (106.7 cm.). Coiled/folded diameter - 15" (38.1 cm.). Sail area - 9.62 sq. ft. (0.8937 sq. m)