why polypropylene is used is because it is hard and firm another reason is because it is a sanitary material however the use of polypropylene is mentioned merely as one preferred material to compose the present invention there abound a panoply of other materials which may also be amenable to injection molding and which may prove equally expedient to serve the essential objectives of the present invention as such the use of polypropylene is not specifically required in the present invention therefore the use of polypropylene should not be construed to be limiting the scope of the present invention because other equally fungible materials may be interchangeably used the base sole 101 is perforated with several holes 106 as illustrated in fig1 and 2 these holes 106 achieve two primary objectives the first objective is to provide a means of attachment with the other pieces of the foot support system 100 holes 106 will mate with the pins 107 which protrude from the other components of the foot support system 100 another function the holes 106 accomplish is to allow for ventilation of air throughout the shoe without ventilation moisture combined with heat will make a suitable environment for mold fungus and other bacteria to propagate this will lead to malodorous smells as well as athlete 39 s foot holes 106 are spaced substantially equidistantly from each other in several rows extending length wise.