I would HIGHLY advise against purchasing this mask! It is so thick on the sides that you cannot sleep comfortably unless you lay on your back and don't turn your head. My hair also gets tangled in the velcro.. It's the absolute worst mask I've ever used.
It is VERY LARGE on my head but does an excellent job of blocking out light. If you are a back sleeper this this is awesome but not very comfortable if you are a side sleeper. Very thick on the sides and doesn't feel comfortable against the head of you are sleeping on your side.
A sleep mask should be light and comfortable. This one is HEAVY and uncomfortable. I wanted to return it but read that to return a Groupon item it must be unsused. So their guarantee is useless. I threw it out.