Durable and flexible elastic ear loop band fits around head and ears securely. One size fits all. Easy to put on and take off. Keep the blue-side outside and the nose clip on the upper side. Adjustable nose strip contour design fits face for a more comfortable fit. Breathable three-ply layers. Blue and white outer layers made of non-woven polypropylene materials. Middle layer is made from melt-blown polypropylene materials for mouth and nose protection. These masks should be disposed of after each use.