A face shield is your protection from the outside influences you come in contact with. From walking in a park, shopping at the groceries, or passing through any space with people, you can come into contact with an array of organisms. Full-face protection can help prevent many germs from gathering on your face.
Simply secure the face shield around the crown of your head, and adjust until it is comfortably tout. For extra precaution, wear a face-mask underneath, and don't touch your face. Wash after use. Use warm water and sanitize.