The fabric used in Zipshades is waterproof, so you can leave them rolled down in rain. We recommend that you do not roll up the screen when wet, as this will prevent the fabric from drying properly, which may result in staining. Wet screens will stretch slightly and won’t roll up as neatly. The fabric is rot-proof and mould-proof, but any substances deposited and allowed to remain on the fabric (pollen, bird droppings, leaves) can rot or mould. As such, we recommend wet screens are rolled down again as soon as possible to allow them to dry.