One of the most important elements of a stand up Paddle Board is its fin or fins. These small protrusions under the board impact all aspects of a SUP’s performance from tracking and maneuverability to speed and stability. What does a paddle board fin do and how do you choose which fin to use? We’ll cover all of that, and much more, below. What do SUP fins do? The simple answer is “pretty much everything.” Fins work by providing resistance in the water. As the board moves across the surface, the fin slices through the water and provides resistance to…