Insulated double walled drinking vessel and method of making the same

An insulated drinking vessel comprising an inner vessel, an outer vessel, and a ring, said inner vessel, said outer vessel and said ring each being formed of a plastic material, said inner vessel being pre-molded and including an inner surface and a top edge portion, said top edge portion of said inner vessel comprising an outwardly-facing annular flange, said outer vessel being pre-molded and including an outer surface and a top edge portion, said top edge portion of said outer vessel comprising an inwardly-facing annular recess, said pre-molded inner vessel being disposed within said pre-molded outer vessel with said outwardly-facing annular flange disposed within said inwardly-facing annular recess to support said inner vessel within said outer vessel without any other means of support and with said top edge portion of said pre-molded inner vessel forming a common flat top surface with said top edge portion of said pre-molded outer vessel, said ring being molded in-situ on said common flat top surface to cause the plastic material thereof to fuse together and intermingle with said plastic material of said ring to form a non-superficial homogenous joint, said ring having an outer surface flush with said outer surface of said outer vessel, said ring having an inner surface flush with said inner surface of said inner vessel, said ring forming the lip of said drinking vessel.