It actually leaves black paint on your face!
I liked it the first couple nights, because then apparently I slept on my back only. But then for one reason or another I started sleeping on my side, and I started waking up with blackish-grayish cast around my eyes. At first I couldn't understand where it came from, but one morning the grey imprint was so thick, that there was no more doubt. It is a shame, since the design is great - there is extra fabric not to let light peek in from under the nose, from the sides of eyes. They need to do something about the issue I described, because otherwise it is a great eye mask - dark enough to sleep well all through the night and morning. Have to give it only two stars because staining of my face is unacceptable.
Rating: 2 stars