An article of footwear comprises a shoe in which the upper and base define a first total internal volume; molding of a standard inner sole made of a material which may be plastically thermoformed using a form, the inner sole having a second volume less than the first volume and, when inserted in a shoe,...http://www.google.co.uk/patents/US6219942?utm_source=gb-gplus-sharePatent US6219942 - Method for the production of footwear and the footwear produced according to this method
