Patent ID: 7703219

Claim:
An elastic inner sole for a shoe having an outer sole, said inner sole having a rearward heel end and a forward toe end, said inner sole comprising: a heel portion; a mid-area portion extending forwardly from a said heel portion; a metatarsal portion extending forwardly from a said mid-area portion; a metatarsal/toe transition portion extending forwardly from said metatarsal portion; a toe portion extending forwardly from said metatarsal/toe transition portion; a base disposed throughout said inner sole, said base having an upper side facing a user's foot and a lower side facing the outer sole; a plurality of compressible blisters provided on the lower side of said base in each of said heel portion, said mid-area portion and said metatarsal portion of said inner sole, said blisters comprising: a dome-shaped structure having a perforation in said dome; and an orifice in said base, said dome-shaped structure extending downwardly from each of said orifices; said blisters being compressed when forces are applied to said respective orifices for absorbing some of said forces and said blisters returning to an initial condition upon relief of the forces, said blisters further dissipating moisture through a pumping action as said blisters are compressed and returned towards the initial condition; orifices in the toe portion of said inner sole, said toe portion being devoid of blisters; and truncated blisters in said metatarsal/toe transition portion, said truncated blisters having orifices and walls extending from the periphery of the respective orifices, said walls being lower than the dome structure of said blisters; said blisters absorbing forces applied by a user's foot to said heel portion, said mid-area portion and said metatarsal portion of said inner sole, and the lack of blisters in said toe portion enabling the user's toes to move around in said toe portion.