FUTURES JOHN JOHN MED TECHFLEX GREEN TRI FIN SETFUTURES JOHN JOHN LARGE TECHFLEX GREEN EDGE TRI FIN SET The John John (M) Techflex signature fin is a medium sized Speed Control fin with a Ride Number of 4. 0. It was designed by JJF to be a larger, more drivey version of the F4 template, with additional base and rake. The Techflex construction and flat foil give this fin a stable feel, making it ideal for controlling speed in more powerful waves. For John John, this is his weapon of choice in all