Transparent PVC foil with aluminum rails is a great protection against weather and other negative external influences while keeping the “view”. It’s perfect as a protection against rain, snow, wind, strong air currents, insects, dust etc. This is a special system for those who prefer mechanical controls instead of remote ones. The foil can be moved with a crank similar to window blinds. As you operate the crank, the PVC transparent foil moves along the aluminum rails, keeping it straight and organized. All transparent PVC foils with aluminum rails are made to customer specifications.