·Outer layer: 100% Polyester (Nano technology fabric) ·Mid layer: 100% Polyester (Antibacterial filter) ·Inner layer: 65% Polyester, 35% Cotton (Antibacterial) ·Flexible, adjustable nose bridge ·Lightweight and breathable ·Machine washable and reusable ·Soft, adjustable ear-loops ·Ergonomic fit ·Sales units of 5 pieces each (e.g. if you need 20 masks please order 4 sales units) ·Non-returnable.