The infamous MFC Fin Co. are into SUP and this is the Speed and Glide fin.  Please note the minimum fin box length required for this fin. MFC say... 

We tested many different outlines and foil sections to gain as much speed and natural glide as possible when racing downwind, and with our final designs Kai Lenny won Gorge Naish SUP Challenge Course Elite Race. So if you are looking for speed, look no more. Minimum box length 17.3cm.