I recommend the no-wash treatment.

It's really convenient because you just need to spray it from a distance before or after washing and drying your hair. There were other colors available, but this shade is really nice too. Even though it doesn't look that big, it lasts a really long time. The scent is so good that I don't even wear perfume these days. If you haven't tried it yet, give it a try. I highly recommend it.