100% Natural look. 100% Easy. Restore your original color in just 5 minutes. Guys have made Just For Men® shampoo-in color for a reason. It makes getting natural-looking, professional results incredibly easy. Your hair color lasts up to 8 weeks until grays grow back. Just For Men shampoo-in color, hair color contains protein, vitamin E, aloe, and chamomile that nourishes your hair while you color. It leaves your hair looking healthier and thicker after every application. Its ammonia-free formula causes no damage to your hair. It conditions your hair and leaves it smoother and easier to manage. Can't decide between two shades? Try the lighter one first. You can always go darker later.