in the injection molding of plastic boots , a reinforced arch and heel construction is disclosed wherein a reinforced insole member , of comparatively rigid material formed in a single piece with a rigid heel portion , is incorporated into the two step process of molding the upper portion and then the sole portion of the boot . in one embodiment the reinforced member is molded to the boot upper during the first step of the molding process , and in an alternative embodiment the reinforcement member is incorporated into the boot during the second step of the molding process . a third simpler embodiment utilizes a conventional wood screw as the heel portion of the reinforcement member , and the member may be inserted after molding of the boot .