What piece of clothing is this called?

Its like a beanie....But elongated, and has a hole on both ends, to where your head can fit entirely through it, and it can just go around your neck, or you can pull the back part up and over the top of your head, creating a ninja-looking head cover. I know a few different ways you can fold it so it fits different needs, but I just dont know what it's called. Anyone know what I'm talking about?