Review (4/5): Not a sleep mask... sleep headphones.
These work great in a pinch for sleeping but they don't really work as a sleep mask. Now that the weather is starting to cool down I'll probably use them a lot more then the occasional nap in a noisy environment. The cord seems pretty heavy duty and it's very long. The speakers are flat, thin, and flexible. It's pretty easy to adjust their position inside the headband to be directly over my ears. I love that I can take the speakers out and wash the headband. They are pictured on the listing as an adjustable headband but the description says pretty clearly that they aren't. So I wasn't surprised.