A surfboard having at least one fin, which an be removably connected to the underside proximate to the board tail end. First and second graduated channels are disposed in the underside, each having a front end shallower than a tail end, wherein the front ends are proximate to the board midsection and the tail ends are proximate to the board tail end, and wherein the graduated channels are substantially parallel to the central axis of the surfboard. A keel is disposed in the underside along the central axis, centered between the first and second graduated channels.