They consist of 3 layers of non-woven rayon fibers, of which the middle layer is a special filter, without fibrous fibers that cause irritation. They have a high ability to filter microparticles. They have a rubber strap and on top they have a built-in nasal foil for perfect fit . The ties are made of a natural material to avoid allergies and are heat-welded without rails. The nasal foil is flexible for a perfect fit . They repel blood and surgical fluids, etc. to protect the user without hampering their breathing. They are packed folded per piece to make it easier to supply staff. Available in a safe and practical package.