the walking sole shown in its entirety in fig1 is designed especially to be incorporated into a golf shoe ( 2 ), shown in fig2 . this walking sole ( 1 ) is molded using a relatively rigid plastic material . according to the invention , the front part of the walking sole has particular transverse flexibility in relation to the place where the front part of the golfer &# 39 ; s foot gains its support , which facilitates the rotation of the foot during the swing . for this purpose , the walking sole ( 1 ) has , in its front part and at least along its outer edge ( 1a ), a combination of two materials having different degrees of elasticity . more precisely , the walking sole ( 1 ) is made up of two parts a and b made of plastic materials having two different degrees of elasticity . the largest portion of the walking sole ( 1 ) is molded using a relatively rigid plastic material and it has , along the front part of its outer edge ( 1a ), a molded part b of a plastic material of an essentially elastic nature or having a degree of elasticity clearly superior to that of the plastic material making up the major part a of the sole . the relatively elastic plastic material used in the molded layer b fills in a series of grooves ( 3 ) which are spaced at intervals and which are formed during the molding of the main part a of the sole . these grooves end on the edge ( 4 ) of the part a and extend in the direction of the median longitudinal plane of the sole , with the same relative position or with different positions , as indicated in fig1 and 2 . the grooves ( 3 ) may be marked off by parallel or convergent sides in the direction of the median longitudinal plane , so as to create a triangular shape . in the grooves ( 3 ) are thus formed individual elastic filling pieces ( 5 ) which may be joined by a border ( 6 ) created by molding at the same time as the individual elastic filling pieces ( 3 ). in other words , the molded part b made of elastic material is formed , according to the embodiment shown in fig1 and 2 , by the continuous border ( 6 ), which actually makes up a part of the exterior edge ( 1a ) of the walking sole ( 1 ), and by the individual elastic filling pieces ( 5 ) which constitute a kind of teeth closely embedded in the grooves ( 3 ) of the part a made of more or less rigid plastic material . the grooves ( 3 ) of part a of the walking sole form the boundaries of the tongues ( 7 ) making up the main molded section a , made of a rigid material . these tongues are flexible transversally around lines x extending through the internal ends of the grooves ( 3 ). to these tongues ( 7 ) may be attached the cleats ( 8 ) extending downwardly to ensure anchoring of the shoe ( 2 ) in the ground . the individual elastic filling pieces ( 5 ) may have either the same thickness as that of the rigid section a of the sole at the place where the grooves ( 3 ) are formed , or a smaller thickness , so that each elastic filling piece partially fills the groove ( 3 ) in which it is embedded , or a greater thickness , in which case it protrudes above the groove ( 3 ). the flexible tongues ( 7 ) may have the same thickness as the individual elastic filling pieces ( 5 ), as indicated in fig3 and 4 , or a smaller thickness . in this case , each tongue ( 7 ) may extend toward the outside from its starting place in the lower part of the edge of the main section a of the sole , made of rigid material , as indicated in fig5 and 6 ; it is , in this case , covered with elastic material b . in the embodiment shown in fig7 the flexible tongue ( 7 ) extends toward the outside from its starting point in the upper part of the rigid main section a of the sole , and in this case it covers a portion of the border ( 6 ) made of elastic material b . in the embodiment shown in fig8 the flexible tongue ( 7 ) extends toward the outside at mid - thickness of the main section a and it is thus overlapped by the plastic material b which extends above and below it . in the embodiment shown in fig9 each flexible tongue extends up to the outer edge of the sole and the individual elastic filling pieces ( 5 ) are separated . here again , the flexible tongues ( 7 ) may have the same thickness as that of the main section of the sole a , as shown in fig1 , or a lesser thickness as shown in fig1 , 12 , and 13 , in which it is evident that the flexible tongue ( 7 ) is found in the lower part , the upper part , and the middle part , respectively , in relation to the thickness of the sole . the lines of flexion x ( fig1 ), by which the different flexible tongues ( 7 ) are attached to the rest of the sole , may be made up of the areas of reduced thickness of the sole . these areas of reduced thickness may exhibit a progressive , or an abrupt , variation in thickness . in the first case , each of the areas is formed by an area which grows progressively smaller . in the second case , each area of reduced thickness is bounded by a groove ( 10 ) ( fig1 and 15 ), which is formed in the upper surface of the sole and which is more or less parallel to the edge of the sole , passing through the internal ends of the various grooves ( 3 ). however , this groove ( 10 ) may , as well , be set in the lower surface of the sole , or else the sole may have two grooves ( 10 ) on the upper and lower surfaces , respectively , these grooves being set in the same vertical plane in order to mark off between them an area of reduced thickness which facilitates the flexion of the tongue ( 7 ). fig1 and 15 illustrate a walking sole with a groove ( 10 ) in its upper surface , having several flexible tongues ( 7 ) of which each one has a cleat ( 8 ), and grooves ( 3 ) extending up to the outer edge of the sole , so that the individual elastic filling pieces are separated . in the embodiment shown in fig1 , the sole has , in its outer edge ( 1a ), only two grooves ( 3 ) which define a single flexible tongue ( 7 ) equipped with several adjacent cleats ( 8 ). here again , the grooves ( 3 ) extend from the groove ( 10 ) to the outer edge ( 1a ) of the sole and are not joined by an external border . on the contrary , in the embodiments shown in fig1 and 18 , the individual elastic filling pieces ( 5 ) are joined by a border ( 6 ). in fig1 , the sole has several flexible tongues ( 7 ), each equipped with a cleat ( 8 ), while in fig1 , the sole has a single flexible tongue ( 7 ) having a series of adjacent cleats ( 8 ), as in the case of fig1 . the different cleats ( 8 ) may be attached to the flexible tongues ( 7 ) of the walking sole ( 1 ) during molding of the sole ; in this case , they are held firmly within the rigid plastic material which makes up the main section a . in the embodiment shown in fig1 , the cleat ( 8 ) is embedded by force in an anchoring piece ( 11 ) which is formed in the sole ( 1 ) during molding thereof . this anchoring piece ( 11 ) has a cavity on its lower surface ( 12 ) that receives and holds in place in an appropriate way the head of the cleat ( 8 ) embedded by force in that cavity . fig2 illustrates a golf shoe equipped with walking sole which conforms to the invention . although in the embodiments of the invention described above , the part b made of molded elastic material is only provided for on the side of the external edge ( 1a ) of the sole ( 1 ), it is evident that the sole may be equipped with a similar piece made of elastic material on the front part of its inner edge ( 1b ) or , simultaneously , on both edges ( 1a and 1b ).