A method of manufacturing an implantable lead includes providing a core including at least one longitudinal lumen providing a jacket comprising a reflowable material positioning the core at least partially within the jacket and, after positioning, applying heat to cause the material of the jacket to reflow and bond to the core. An implantable lead includes a core including at least one longitudinal lumen and a jacket comprising a reflowable material. The core may be at least partially disposed within the jacket with the material of the jacket reflow-bonded to the core. The implantable lead may further include at least one lead component associated with at least one of the core and the jacket.