A gas mask is an object or device that is intended to protect its user from toxic gases and other health-harmful residues. If you are a factory worker, builder or someone who works around toxic substances or vapours, it is a good idea to have one.
Gas masks with different functions are available on the market. Some are exclusively for fires, others for painting, some more professional ones to avoid highly toxic gases or chemicals.
In the past, these masks were uncomfortable and obstructed the visibility of their users, but over time they have become more ergonomically designed. Now they not only look great when you put them on, but they are also quite comfortable.