Flex characteristics play a huge part in the performance aspects of a fin… Softer (or fins with more flex) will load up and release energy when maneuvering the board up and down the wave face which delays reaction time but will ultimately provide more projection. Flex can add an energized feeling to your board. A stiffer fin will add control and quicken reaction time, lending itself to faster and more critical wave types where those rapid changes are needed. Check out our Fin Terminology page for more info.