Adjustable one size fits most adult male or female. It is suitable for working areas where glass, metal, paint, agriculture, formaldehyde and other irritating vapors/gas are made. It is dustproof in mechanical operations (such as welding, sawing, grinding, graffiti, etc.). Areas with haze, dust, sand and car exhaust in daily life. You can even wear a breathing face-cover when cleaning at home to prevent inhalation of dust. The compact appearance and low-key design make the wearer's vision wider. The expiratory valve has a wide opening range and exhales smoothly. Reduce internal heat and moisture accumulation, and the air is fresher. Color: Gray.