Surgical Masks are disposable masks with a loose fit. They are designed to keep wearers safe from germ-infested drips and sprays. When the wearer inhales deeply, a medical mask filters out big particles in the air. The amount of carbon dioxide in the air you breathe does not increase when you use a medical mask. Surgical masks are still regarded as a useful kind of PPE because they give some respiratory protection and can prevent sick people from spreading infectious respiratory droplets. The adjustable nasal strips on these masks assist keep air from seeping out the top.