Combining 12K and Unidirectional carbon fiber reinforces Freefall’s strongest, lightest and most robust fin construction. 12K is the stiffest carbon fiber available and when used as our base it creates more resistance and less flex, resulting in more drive. Unidirectional carbon runs in the same direction rather than woven together and is used for strengthening air plane wings where more stiffness is needed. Not only that, it is lighter than woven carbon and fiberglass making our 2x technology lighter and stronger. Combine all that into our Freefall Pro series gives our fins a more lively feel due to the way the flex responds in a much faster manner. Take the decision-making out of your next fin choice, nothing on the market compares in price to what 2x technology offers.Â