Have to agree with Denr re canvas cover. Ecology AND economy both factored into our decision. Canvas, we can put up. Shrink-wrap, they charge you to put it up, and their prices never seem to go down. One local owner found out how good his insurance was when the shrink-wrap messed up & discolored his topsides. Canvas can be simple tarps, or a finely fitted cover == whatever suits you. We''ve used canvas tarps on a frame since ''96, and figure it''s paid for itself twice already, compared to shrink wrap.