Medical masks are also known as procedural masks or surgical masks. These are worn by healthcare workers during surgical procedures, mainly to stop droplets and bodily fluids from entering or leaving the wearer's mouth and airway. Medical masks are often 3-ply and looser in fit, so airborne particles can leak around the edges. In contrast, respirators have more layers and are designed to seal against the user's face, forcing air and particules through the filtration layers where they can be captured.