Doesn't block much at all. Returned.

Tried them on. Though I can wear pretty much any sunglasses comfortably, the ears of these ones dug into my skin. Would have found a way to deal with that if they had actually been useful at providing a little darkness and peace. They block out what's in front of you, but the top, bottom, and sides are fairly open, even with the little padding that they have. Worse, if there's sunlight around you, the glasses reflect it directly into your eyes, making it almost worse than nothing at all. Would like to see someone come up with a sleepmask-type product that doesn't look like a sleepmask, but this just isn't it.

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