KN95 Mask respirator, a surgical mask has four layers, it can protect you from the virusInstructions :1. Keep the front outside, and hang straps over ears.2.Close to the face,and stretch the mask until it fully covers the nose,mouth and chin3.Adjust the nose clip and press it, and keep it closely to nose and faces.4.If damaged, smelly or damp,please replace it with a new one immediately.