Abstract: A ski, particularly an Alpine ski, wherein the steering of the ski while edging, particularly its ability to execute carved turns, and its edge grip, are improved in that the lateral boundary lines of its bottom edges are so designed that the width of the ski has a relative maximum adjacent to the midpoint of the ski and a relative minimum in the forebody and in the afterbody of the ski. To facilitate the use of the design according to the invention in skis differing in length, it is proposed to superpose a concave base curve and a convex curve portion at the center of the ski. In order to facilitate the use of numerically controlled machines for manufacture, a complete mathematical expression for an embodiment of the invention is stated.