Rubber band colors may vary in white Washable Protection Mask Blue, 100% Cotton, double layered with a pocket for a free filter. Universal Size with adjustable rubber bands 20 cm x 9 cm (Up to 20 cm x 15 cm) Basic protection is provided by the double layered cotton material. To ensure maximum security against viruses and germs use the included medical grade filter. Simply put the filter inside the pocket opening of the protection mask. IMPORTANT: Dispose the medical filter after 12 hours of use for maximum protection. You can wash the protection mask in a washing machine up to 90 degrees, you can sterilize the mask by cooking it in water. The protection mask is made from 100% cotton, the rubber bands are adjustable. Filter packs of 30 pieces sold separatly. They are washable and can be ironed.