This is not a medical device !! The mask is made of three layers of 100% cotton with a water repellent treatment. The fabric is certified and specially treated with silver ions, which does not allow bacterial retention. Withstands a minimum of 50 laundry and ironing at 60 'temperature. Fine and soft reusable mask designed to protect the nose and mouth. It is attached to the face by two elastic bands crossed behind the head.