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.