MARES AVANTI EXCEL Following numerous tests on new materials in the field and in the lab, and after intense computer simulations, the Mares Avanti Excel was born. The Super Channel Thrust makes it possible to channel the water and optimize thrust in comparison to other fins of similar size. The elastic OPB system ensures that the blade is always at an optimal angle during both the upward and downward strokes, thus considerably encreasing efficiency. The whale fin section in the foot pocket allows for greater transmission of power, with improved sensitivity when finning. The consequent advantage is greater thrust with the same effort.