What is it? A One 'n Only Exothermic Perm is the one perm for the firmest, longest lasting curls on normal, tinted and resistant hair. Curls will be strong and defined and easy to manage. The self-heating formula uses gentle heat to provides maximum client comfort and ensures shine and manageability, even on tinted hair. What makes it special? - Self-heating formula provides maximum client comfort - Ensures shine and manageability, even on tinted hair - Ideal for styles requiring strong curl support - Eliminates perm odor Read all directions included with package carefully.