Our Ultra Mask is fully reusable and washable. Both the outer fabric and inner lining are coated with an anti-microbial finish to repel both bacteria and viruses and so do not require constant washing after use. With average use of up to 5 hours per day, we recommend washing the mask once p/week in cool water, by hand with pure soap flakes and hanging somewhere to dry. Our FilterTech Liners are not reusable.