Shoe having a replaceable sole

1. A shoe comprising: (a) a sole having a thin cavity defined by a sidewall which extends around the periphery of said sole, said sidewall having a predetermined thickness and a bottom surface; (b) said sidewall including a plurality of flaps which extend into said cavity, said flaps having bottoms which are contiguous with the bottom surface of said sidewall and a thickness which is less than the thickness of said cavity; (c) a sole plate sized to substantially fill said cavity, said sole plate having an outer surface which is generally flush with said bottom surface of said sidewall when said sole plate is in said cavity; and (d) said sole plate having a plurality of depressions located in said outer surface, said depressions being configured to receive said flaps when said sole plate is placed in said cavity;

wherein said flaps are made from a material which is sufficiently elastically deformable to permit said sole plate to be inserted past said flaps when said sole plate is placed in said cavity and yet hold said sole plate in place in said cavity; and

wherein said flaps are harder than the remainder of said sidewall.

2. The shoe of claim 1 wherein said flaps have a hardness of between 90 and 95 Shore A Durometer and the remainder of said sidewall has a hardness of between 80 and 85 Shore A Durometer.

3. A shoe comprising: (a) a sole having a thin cavity defined by a sidewall which extends around periphery of said sole, said sidewall having a predetermined thickness and a bottom surface; (b) said sidewall including a plurality of flaps which extend into said cavity, said flaps having bottoms which are contiguous with the bottom surface of said sidewall and a thickness which is less than the thickness of said cavity; (c) a sole plate sized to substantially fill said cavity, said sole plate having an outer surface which is generally flush with said bottom surface of said sidewall when said sole plate is in said cavity; and (d) said sole plate having a plurality of depressions located in said outer surface, said depressions being configured to receive said flaps when said sole plate is placed in said cavity; and

wherein said flaps are placed on opposed sides of said sole proximate the heel, the arch and the ball, of the shoe.

4. A shoe comprising: (a) a sole having a thin cavity defined by a sidewall which extends around the periphery of said sole, said sidewall having a predetermined thickness and a bottom surface; (b) said sidewall including a plurality of flaps which extend into said cavity, said flaps having bottoms which are contiguous with the bottom surface of said sidewall and a thickness which is less than the thickness of said cavity; (c) a sole plate sized to substantially fill said cavity, said sole plate having an outer surface which is generally flush with said bottom surface of said sidewall when said sole plate is in said cavity; and (d) said sole plate having a plurality of depressions located in said outer surface, said depressions being configured to receive said flaps when said sole plate is placed in said cavity; and

wherein said sole has a toe end and a slot is defined in said sidewall proximate said toe end and said sole plate includes a tab which fits into said slot when said sole plate is placed in said cavity.

5. The shoe of claim 4 wherein said sidewall includes a ledge which extends into said cavity below said slot and said sole plate includes a recess which is located below said tab and receives said ledge when said sole plate is placed in said cavity.

6. A shoe comprising: (a) a sole having a thin cavity defined by a sidewall which extends around the periphery of said sole, said sidewall having a predetermined thickness and a bottom surface; (b) said sidewall including a plurality of flaps which extend into said cavity, said flaps having bottoms which are contiguous with the bottom surface of said sidewall and a thickness which is less than the thickness of said cavity; (c) a sole plate sized to substantially fill said cavity, said sole plate having an outer surface which is generally flush with said bottom surface of said sidewall when said sole plate is in said cavity; and (d) said sole plate having a plurality of depressions located in said outer surface, said depressions being configured to receive said flaps when said sole plate is placed in said cavity; and

wherein said sole plate has a heel end including a strap which is attached to said sole plate proximate said heel end and an attachment device located on said shoe which receives said strap and places said strap in tension to hold said sole plate in said cavity at the heel end of said sole.

7. The shoe of claim 6 wherein said strap is elastically deformable and has an opening defined in a distal end, and said attachment device is a hook which said opening can be placed over by pulling upwardly on said strap.

8. A shoe comprising: (a) a sole having a thin cavity defined by a sidewall which extends around the periphery of said sole, said sidewall having a predetermined thickness and a bottom surface; (b) said sidewall including a plurality of flaps which extend into said cavity, said flaps having bottoms which are contiguous with the bottom surface of said sidewall and a thickness which is less than the thickness of said cavity; (c) a sole plate sized to substantially fill said cavity, said sole plate having an outer surface which is generally flush with said bottom surface of said sidewall when said sole plate is in said cavity; and (d) said sole plate having a plurality of depressions located in said outer surface, said depressions being configured to receive said flaps when said sole plate is placed in said cavity; and

wherein said flaps have rounded downwardly and inwardly facing edges.

9. The shoe of claim 8 wherein portions of said sole plate which are located above said depressions have rounded outwardly and upwardly facing edges.

10. A shoe comprising: (a) a sole having a thin cavity defined by a sidewall which extends around the periphery of said sole, said sidewall having a predetermined thickness and a bottom surface; (b) said sidewall including a plurality of flaps which extend into said cavity, said flaps having bottoms which are contiguous with the bottom surface of said sidewall and a thickness which is less than the thickness of said cavity; (c) a sole plate sized to substantially fill said cavity, said sole plate having an outer surface which is generally flush with said bottom surface of said sidewall when said sole plate is in said cavity; and (d) said sole plate having a plurality of depressions located in said outer surface, said depressions being configured to receive said flaps when said sole plate is placed in said cavity; and

wherein portions of said sole plate which are located above said depressions have rounded outwardly and upwardly facing edges.