Except for the little electronic control box in the forehead portion and the small audio speakers and adjoining wires, the entire thing is made of superbly-soft material, very comfortable!! The speakers are perfect because they are pretty much thin discs that transmit sound AROUND the ears rather than penetrating ear buds that would present a threat to hearing over prolonged sleep hours. The box and the speakers sit loosely in their own built-in ‘sleeves’ in the well-designed cloth. The velcro strap on the back of the head is sufficient for a wide range of head sizes.

A bit of a problem arises because the speakers sit a bit loose inside their respective sleeves, causing them to sometimes fall a bit too far from the ear canals for good sound transmission while sleeping…and so one tends to tighten and adjust the whole mask portion to get the speakers to land just right. But in doing so, another little problem becomes evident in that the curve built in to slot around the nose, doesn’t curve in enough, and so the bottom edge of the mask will tend to cover the nostrils when trying to get the speakers to cover the ears. It’s a bit annoying but not unmanageable.

The tiny light indicators that emanate from the plastic control box inside the mask have to shine through very tiny holes cut into the mask, sometimes these don’t line up well because the box sits loosely inside its own little sleeve like the speakers do…so these lights are very hard to see, making it hard to know if its connected and charging, to make sure you have correctly plugged it in to charge or not.

I bluetooth into the mask via my ipad at bedtime. However, after getting up in the morning, when I sit at my desk, I notice my ipad refuses to play sound because it has not disconnected from the mask on its own, obviously since it doesn’t know that I have gotten up. But pressing the power button on the mask does not ‘shut off’ the mask or cause the ipad to disconnect from the mask. So I have to manually “Disconnect” from Musicozy in order for my ipad to play sound. It seems the power button on the mask really only serves to pair the mask to a device.

Again, minor issues IMO, little bits I have gotten past enough to say that I am very happy with how this product delivers what it claims to deliver. I helps me sleep much more soundly than I did without it.

I’m also very pleased with the sound quality of the earpieces. I’m a stickler for having nice headphones, so the thought of tiny speakers in this sort of thing made me skeptical, but everything actually sounds really good. Other reviews are right, though: it can be a bit difficult to position the earpieces, because the sound coming out of them is extremely focused. If it’s not pointing directly into your ear by even half an inch, it’s surprisingly difficult to hear.

The one thing I don’t like is the fact the adjustment strap uses velcro. I have hats that use velcro, and just leaning back into my chair’s headrest can mush my hair into the velcro and cause it to tangle up and get stuck. Waking up and having to brush out a velcro hairball from this eye mask every morning is going to get annoying.

At the same time, the velcro adjustment strap here IS a lot thicker and more sturdy than just the single elastic band you get with most eye masks. Those elastic bands stretch and wear out over time, and presumably, this won’t do that. It’ll last as long as that lithium battery does. I just wish there was a better way that didn’t risk tangled hair.

I also sometimes wake up with sore earlobes. Despite this being advertised for side sleepers, there’s still a bit of plastic in there that does press against the outside of your ear. But it’s better than wearing actual headphones, I guess.

The only other problem I have is more to do with the Android operating system, but: generally speaking it would be nice to have more gradients of volume. The lowest volume is almost too quiet to hear, and just one notch up on the volume slider is almost too loud to sleep through. I really want a half step between those two points and there doesn’t seem to be a way to get it. But again, that’s not really an issue with the mask itself and has more to do with Android — I’ve had this problem with everything except the one headset I used to have with its own dedicated volume knob.