Abstract: The present invention provides an extendable and retractable cover for the cockpit of a small boat, especially for but not limited to boats of the recreational type. A cover sheet is rolled on to a roller that is disposed across the transom of the boat and may be unrolled to follow guides along the edges of the sides of the cockpit and to be latched to the top of the boat's windshield. Mechanism, preferably electrically operated, is provided for rolling and unrolling the sheet. The opposite edges of the sheet are reinforced by wear strips or beads that run in the guides. Cable and sheave or pulley devices are provided for rolling and unrolling the sheet. The structure may be provided as original equipment or as an after-market attachment.