John John Florence Techflex - Digital Red (L)John John Florence Techflex Thruster Fin Set Digital Red (Large) The John John Florence Techflex thruster is John's daily driver and the fin that he rode exclusively to 3 World Championships. Johns approach in both waves of consequence and high performance competition show the versatility of the Techflex construction. Stable and predictable at high speeds, as well as springy and responsive in more playful conditions. John opts for the Large fin size