【NOT A ONE-OFF】Is Made of Polyester Fiber, Breathability Comfortable,washable, Reusable, Easy to Care for Durability.【HUMANIZATION DESIGN】Dust Masks Ergonomic Cut on Nose and Adjustable Elastic is Enough for Cover Nose, Mouth and Face. Very Comfort to Wear and Effortless Breathable.【FEATURE】M-7.9"L×5.9"W(20cm x 15cm), Easy to Wear. The Mask's Strap Has a Button That Adjusts the Tightness.