I've used various sleep masks over the years for travel, and I've always kind of dreaded using them, because I'm a side sleep and they get warm. After reading multiple reviews of different eye masks, I decided to try the Evercool Cooling Eye Mask. Wow, was I surprised. It's very comfortable on my head, and because it's the same thickness all around, I can easily sleep on my side. I have long eye-lashes, and the mask doesn't bother me at all. And it actually feels cool on my skin! It's such a perfect eye mask that I use it every night at home. I usually take it off sometime in the night (often without realizing it), but I've found it helps me go to sleep. This really is the perfect mask for me!