No matter how many times you give yourself a deep conditioning treatment at home, it never turns out quite the same—satiny, soft—as when your stylist applies it in the salon. What’s missing? Heat. A little heat goes a long, luscious way in yielding hydrated locks in the comfort of your own home. The next time your brittle mane needs a double dose of moisture, use your favorite treatment mask or conditioner and one of the heat caps in the gallery below to help penetrate the hair shaft faster, better, harder, stronger.