There is provided a removable insole for insertion into a shoe, including a substantially impervious flexible base having an overall anatomical shape and an outer periphery. The base further includes a plurality of upwardly extending compressible support columns each having a central axis and being attached...http://www.google.co.uk/patents/US5035068?utm_source=gb-gplus-sharePatent US5035068 - Shoe and removable shoe insole system
