Our reusable mask is designed to fit comfortably around your face and has 4 darts which creates a perfect shape, makes it almost air tight except for the gaps either side of your nose. This mask has 3 layers of fabric, outer layer can be Cotton or Poly, middle layer is a special fabric called TNT which specifically made for masks then the third and final layer in soft cotton next to you face. Our mask comes in XS, S, M and L. Size M will fit all grownups and teenagers. Size S mask is for kids and XS is for toddlers. Our L mask fits well if you have a wider face and this will cover your beard too.