"the present invention, FIGURE 2 is a bottom plan view of the sole of the shoe of FIGURE 1, and FIGURE 3 is a fragmentary sectional view taken along the line 33 of FIGURE 1 and viewed in the direction of the appended arrows. ' Referring more particularly to the drawing, there is shown, by way of example, a shoe of welted construction having an upper 7., an inner sole 3, and an outer sole 5, all con" . . . .