1 central fin: ideal configuration on a lake in calm waters. It allows great sensations, to keep speed and trajectory. 2 fins (twin): configuration of smaller fins on the side generating more speed and grip, practical in rivers, whitewater and shallow water. 3 fins (thruster): configuration single fin + twin used only in surf and SUP surf. It allows to keep speed and a better grip in the waves. 4 fins (quad): specific configuration for surfing and SUP surfing for big hollow waves, allowing a better grip in the tube. It can also be used for SUP in rivers, whitewater and shallow water.