with a rear counter 22 these portions of the shoe sole 14 are integrally formed one with the other the shoe sole 14 may be injection molded of a suitable polymer material in a conventional fashion and may comprise for example an injection molded plastic or other equivalent materials conventionally used for shoe sole construction the shoe sole 14 is formed as an integral unit with an upper surface 24 and a lower surface 26 joined together by a sidewall 25 which extends about the entire periphery of the shoe sole the sole 14 may be integrally formed of a single material of desired density it may also be provided with an instep insert 27 integrally molded with the remainder of the shoe sole 14 with this instep insert having a different density of durometer than the remaining portion of the shoe sole to provide added or different stiffness from the remainder of the shoe sole the inset may take a variety of forms as illustrated in fig2 the insert 27 has an u201c h u201d like configuration with a plurality of openings 28 formed in it through which the material forming the remaining portion of the shoe sole 14 may flow on molding for greater and more intimate inter engagement with the.