Straight luff furling is ideal for use with code zero sails and gennakers. These sails have more shape than a genoa but not so much that they can't be furled around a luff rope. They require an anti-torsion line to be sewn into the luff of the sail. When furling commences, the tack and head of the sail rotate at the same time to neatly bring the sail in. Once furled, the sail, complete with torsion rope can then be easily stowed and replaced making for easy sail changes.