This inner mask is made of a Nova check pattern cotton flannel material with Japanese-made gauze on the back. It feels good against the skin and is breathable. While masks that use this check pattern on only half or a portion of the mask are relatively common, a mask with the check pattern covering the entire surface is quite rare. Although it's an inner mask, it has openings for elastic bands, so you can add your own elastic and use it as a mask. Please be sure to read the profile section. #UsesHighQualityGauze#MadeInJapan#JapaneseGauze Bottom left