Insert for article of footwear and method for producing the insert

An article of footwear, comprising

• a sole, said sole having a portion formed to receive an insert;
• and
• an insert mounted in said portion formed to receive an insert, said insert comprising:
• a compressible core allowing pressure to be applied thereon by a foot, said compressible core having a top surface, a bottom surface and a peripheral surface;
• and
• a flexible casing for substantially surrounding and encircling said top surface, said bottom surface and said peripheral surface of said compressible core, said flexible casing having a top portion, a bottom portion and a peripheral portion, said flexible casing having an open window, said open window having a size which is sufficient for insertion of said compressible core into said flexible casing but small enough to leave sufficient material surrounding said open window and encircling said top surface, said bottom surface and said peripheral surface of said compressible core to confine said compressible core therein, said peripheral portion of said flexible casing being spaced from at least a portion of said peripheral surface of said compressible core, while not interfering with said foot applying pressure to said compressible core.