it is a leave-in heat: ie it affects your hair to protect it during the drying hair dryer and hair straightener: my hair is bleached blond platinum is I have very dry hair porous and not only it gives them a certain outfit but they are soft and re-inflated (does nothing on brightness).
Ideal for very mistreated hair like mine: ca honestly at a cost but it works very well. And god knows I have sought solutions for ultra dry hair .... my ca is one.