A cover for a hatch lid or similar structure of a boat provides a secure, custom fit but is easily replaceable and maintainable. The cover includes a sheet of material having a periphery sized approximately to fit over a hatch lid of a boat and a securing feature including an elastic band extending along a portion of the periphery of the sheet, configured to securely couple the sheet of material to the hatch lid. The cover also includes a first corner strap and a second corner strap located on an underside of the sheet of material configured to fit over respective corners of the hatch lid.