Abstract: A shroud supporting frame structure extends transversely of an open boat and is connected with its gunwales to form a weatherproof collapsible concealing cover for a hunter. The frame structure includes a plurality of bow elements swingably mounted for movement in a fore and aft direction about respective horizontal axes. Frame stop pins and a counterbalancing action of the bow elements supports the blind in a first relative disposition presenting a concealment cover and permits movement of at least one of the bow elements to a second partially collapsed relative disposition to present an opening therein affording an unobstructed field of view.