A head cover (800) has selectable size and location of at least one opening (812, 814) for exposure of a portion of a user's hair to an external hair treatment environment. The cover includes an impermeable outer surface that protects hair thereunder from an external hair treatment environment. A main opening (802) in the cover receives a user's head inserted into the cover. An opening (812, 814) on the cover, separate from the main opening, has an opening size selectable from selectable sizes and has an opening location selectable from selectable locations on the protective head cover. The opening (812, 814) selectively exposes a portion of the user's hair from under the cover to an external hair treatment environment while the cover protecting another portion of the user's hair from the external hair treatment environment.