Just For Men Shampoo-in Gray Hair Color H-35 Medium Brown. Fast and easy Shampoo-In Color for a natural gray-free look. Just For Men Shampoo-In Color covers your grays completely permanently and effectively. It targets only the gray hair and preserves subtle variations of your natural hair color. This easy to apply hair color only takes five minutes to restore your original color and lasts until the gray grows back. Just For Men Shampoo-In Color contains Keratin Olive oil & Vitamin E to support strong and fuller healthier-looking hair. The results are 100% natural looking. Its ammonia free formula causes no damage to your hair while giving you professional looking results. Can t decide between two shades? Try the lighter one first. You can always go darker later.