A shoe upper easily connected by a connecting device to a lower member or mid sole having a lattice structure. The shoe also includes additional connecting devices to releasably connect the heel to the mid sole and upper. The outer sole is connected to the mid sole by glue or double-sided tape. The mid...http://www.google.es/patents/US4349970?utm_source=gb-gplus-sharePatente US4349970 - Shoe
