A customized sealing member is for a customized mask. The customized mask includes a support member. The customized sealing member is manufactured by the process of generating surface geometry data of a face of a patient, the surface geometry data corresponding to and representing a surface geometry of the face of the patient; providing a directing apparatus shaped according to the surface geometry data, the directing apparatus being structured to receive and direct a stock of material; and inserting the stock of material into the directing apparatus in order to produce the customized sealing member.