A flotation hood removably extendable over the top portion of a main sail of a watercraft and being movable with the sail without being joined thereto. The hood includes a first and a second flotation panel section contained in pockets of an envelope on opposite sides of the sail, the envelope having a vertical web portion extending at least partially around the sail bolt rope to move vertically within the mast channel. Each panel section includes a plurality of plastic flotation panels that are connected together for hinged movement about predominantly vertically extending axes with the trailing edge of one panel being adjacent to the leading edge of a second panel. A shackle bolt is connected to a halyard and is extended through shackle bolt apertures in the sail and hood for hoisting the hood and sail.
