Foils are not always aluminum...
...and are not always segmented. The foil for some smaller furlers, like the CDI used on most Hunter 26/260's, is a rigid plastic extrusion. It has a groove for the sail and one for the stay. The foil on the Snapfurl also is a full length extrusion, but it's in 2 halves which snap together lengthwise around the stay. I think I'd want a foil on anything bigger than a daysailor, but that's just my opinion. If you go "foilless" I think you have to either fully set or fully furl the jib--no reefing.The reason most trailerable Hunters have the CDI is that it has its own halyard built in. As far as I know, it's the only small boat furler with this feature. Without that feature, the jib has to be removed to lower the mast so that the halyard is available for lowering.