Abstract: A method and system for the application of hair treatment solution, such as permanent solutions, to the hair is disclosed according to the preferred embodiment of the present invention. Specifically, the present invention includes hair curlers having cylindrically shaped outside surfaces and hollow interiors. After the curler is rolled in the hair, vapor retainers may be placed around the hair rolled on the hair curler. The vapor retainer includes in its most preferred form, first and second semicircular members hinged together for defining a hair treatment solution receiving volume. Vaporized hair treatment solution may be injected into the interior of the hair curler for communication with the hair located within the vapor retainer. In its most preferred form, the curler includes a frustro-conical portion extending into the interior of the curler and having a closure formed from wedge-shaped flaps.