The mask is worn almost all day so it must have characteristics that make it perfect: 1) be inexpensive, washable and reusable. Of course, because it cannot be thrown away every day, it would cost too much both as a daily expense to people and as disposal costs for landfills. 2) the mask must allow excellent breathing, not release strange odors (they could be harmful) and must allow us to breathe serenely without weight. 3) it must be water repellent in order not to release saliva particles to other people, therefore have a fabric in accordance with this characteristic. The TZ 27 mask is all of this. Not a mask like the others. At this LINK info and prices, and it is also available with personalized printing. From only 10pcs, anthracite gray color.