Side shell is selected to match the base shell and each of the two parts is slid onto the base shell. After that close the two side parts with the closing buttons. Then fill up to the desired height with Alginate impression material. Alginate impression material is poured into the shell. After a few minutes the foot can be demoulded. The buttons can be removed and the two side parts are separated with the separating spatula. Then the foot can be removed from the mould and the Alginate impression can be poured with Molding Resin.