This 2-layer face mask in a basic shape is made from breathable 260g polyester fabric and has an inner layer of 115g polyester fabric. The opening in the mask allows you to add your own filter to the mask. The fabrics have an Oeko Tex 100 certificate. The masks can be washed in temperature up to 60 degrees Celsius, which makes them reusable. Not intended for medical use or as PPE.