A continuous line furler is designed for handling "flying sails" (gennaker, staysails, light jibs, etc.). Flying sails are sails that are not permanently rigged (unlike a genoa on a reefing system) and are stowed below when they are not used. Unlike a manual headsail reefing system, a furler only allows sailing with the sail completely unfurled. It does not allow sailing under reduced sail and does not contribute to supporting the mast. Drum furlers have a classic furling line like manual reefing-furling systems.