This little thing is clever. I ordered the one that’s designed to add cushion to the kind of airplane seats that have the built-in, adjustable headrests. You can strap it to your seat without disturbing the person’s TV screen behind you. The blue part adds extra cushion, while the black eye mask attaches with Velcro-type fasteners. Because of how it attaches, you can make the eye mask as snug as you want. I was able to block out all of the light completely, which is not something I can say for a lot of eye masks. The entire thing fits nicely in the provided pouch. Big win. I’ll be ordering more as gifts for my traveling friends.