An outer sole member for an article of footwear, comprising: a cleat system including a plurality of fixed cleat members having an elongated ridge-like shape, and a plurality of removable cleat members having a conical tapered shape, the plurality of fixed cleat members including a first group of fixed cleat members disposed in a forefoot portion of the outer sole member and a second group of fixed cleat members disposed in a heel portion of the outer sole member; the plurality of removable cleat members including a first group of removable cleat members disposed in the forefoot portion of the outer sole member and a second group of removable cleat members disposed in the heel portion of the outer sole member; the first group of fixed cleat members having a first height and the first group of removable cleat members having a second height; and the second group of fixed cleat members having a third height and the second group of removable cleat members having a fourth height; wherein the difference between the first height and the second height is approximately equal to the difference between the third height and the fourth height, characterized in that in all of fixed and removable cleat members (300, 200), which are disposed on the outer peripheral region of the outer sole member with the elongated ridge-like shape of the fixed cleat members extending along the outer periphery of the outer sole member, each one removable cleat member (211, 212, 213, 214, 215, 216) is associated to one corresponding closest fixed cleat member (311, 312, 313, 314, 316, 317); and wherein a distance spacing (S1, S2, S3, S4, S5, S6) between each removable cleat member (211, 212, 213, 214, 215, 216) and the corresponding one closest fixed cleat member (311, 312, 313, 314, 316, 317) is constant. a cleat system including a plurality of fixed cleat members having an elongated ridge-like shape, and a plurality of removable cleat members having a conical tapered shape, the plurality of fixed cleat members including a first group of fixed cleat members disposed in a forefoot portion of the outer sole member and a second group of fixed cleat members disposed in a heel portion of the outer sole member; the plurality of removable cleat members including a first group of removable cleat members disposed in the forefoot portion of the outer sole member and a second group of removable cleat members disposed in the heel portion of the outer sole member; the first group of fixed cleat members having a first height and the first group of removable cleat members having a second height; and the second group of fixed cleat members having a third height and the second group of removable cleat members having a fourth height; wherein the difference between the first height and the second height is approximately equal to the difference between the third height and the fourth height, characterized in that in all of fixed and removable cleat members (300, 200), which are disposed on the outer peripheral region of the outer sole member with the elongated ridge-like shape of the fixed cleat members extending along the outer periphery of the outer sole member, each one removable cleat member (211, 212, 213, 214, 215, 216) is associated to one corresponding closest fixed cleat member (311, 312, 313, 314, 316, 317); and wherein a distance spacing (S1, S2, S3, S4, S5, S6) between each removable cleat member (211, 212, 213, 214, 215, 216) and the corresponding one closest fixed cleat member (311, 312, 313, 314, 316, 317) is constant.