It has one major flaw.
So far, these are working better than the previous one that I had bought [[ASIN:B00FJQFJX8 Bedtime Bliss BTB01 Contoured & Comfortable Black Sleep Mask with Moldex Ear Plugs]] which literally came apart at the seams on both top and bottom. I've only work these a few times, but in order for them to work, I needed to make the strap as long as possible. This leads to the main flaw: that the velcro in the back is exposed and that my hair gets stuck to it, every single night. This could be fixed by having another piece of velcro (the female side) that covers up the exposed velcro (male side).<br />If this product lasts longer than the product I linked above, I will be happy to change my review.
Rating: 4 stars