Travel Sleep Mask in gray color. If you are bothered by light and want complete darkness to enjoy an uninterrupted sleep, then a sleep mask is the right choice for you. This particular one is made of polyester material, usually a blend of cotton and acrylic threads, for ultimate protection from artificial or natural light and a gentle feeling on the skin. The mask features an impressive design that will surely attract all eyes! Finally, the package includes a case so you can have it with you at all times.