MFC SUP RACINGSpeed and Glide are key for this fin. We tested many different outlines and foil sections to gain as much speed and natural glide as possible when racing downwind. With our final designs Kai Lenny won Gorge Naish SUP Challenge Course Elite Race and is still a head of the rest as we right this presentation. Size Box System Material 20 cm US BASE RTM 22 cm US BASE RTM 24 cm US BASE RTM