I use an eye mask every night but lost my precious eye mask while traveling on the plane so I decided to purchase a new one. The design of Lewis N. Clark looked identical to my previous one, which brand I don't know, so I thought it might be the same one. Oh, but what a mistake. Lewis N. Clark eye mask is made out of some harsh nylon-like material (my older one was made out of plush wool/cotton like material) that irritates my skin. I have been waking up with the eye mask thrown on the ground. I am currently using another purchased eye mask that's made out of satin-like fabric, which is much better. I am surprised at all the good reviews here.