Wind tunnel tested shape lowers friction, enhancing sail performance Fine finish surface reduces friction between foil and sail resulting in - faster sets and douses high impacts eliminates Stainless steel, snag-free feeder allows spinnaker sheets to pass freely LUFF TAPE TUFF LUFF AERO Tuff Luff Aero represents a major evolution of slotted headstay systems. Its unique aerodynamic shape provides at least 9% more lift. Faster wind reattachment to the sail with less turbulence is also a benefit of this patented teardrop shape. If you have the need for speed, you have a need for Tuff Luff Aero.