The component pieces are sewn together by skilled machinists so as to produce the completed upper. The work is divided in stages. In early stages, the pieces are sewn together on the flat machine.
In the later stages, when the upper is no longer flat and has become three dimensional, the machine called post bed machine is used. Various edge treatments are also done for giving an attractive look to the finished upper. At this stage, the eyelets are inserted in order to accommodate the laces in the finished shoes.