1Comfortable mask: Dust mask with exhalation valve and double filter system for reduced breathing resistance and good weight distribution, light body with unrestricted vision for pleasant, fatigue-free work. 2Great fit: Mouth guard mask has adjustable nose band and elastic fastening straps, fit to any face shape, even if you wear glasses, to prevent your breath fogging up your glasses! 3Easy filter change: Insert the filter, along the inside of the mask. It can be changed quickly and easily, and several ways.(Filter is not included) 4Function: This protective mask is suitable for both renovation and renovation work as well as for sawing, drilling work, effective protection against haze, dust, pollen and others, ideal for people who suffer from diseases, live in areas with high air pollution or travel.5 5 layers of filter sheet protection, in order of anti-sticky cloth, filter cloth, activated carbon, funny filter cloth, anti-sticky cloth