His desire for a new 4.0 and 4.4 design developed on a 370 mast has added two very useful high wind sizes to this already efficient lineup of sails that are ready for flying and flipping in total control. The other sizes also got plenty of attention. The slightly flatter upper profile and more progressive leech tension are in perfect synch for the modern freestyle maneuvers that are made possible by having this type of balance and control. Just ask Taty and he will tell you these new sails make him fly!