Properties: 1. High efficiency and low breathing resistance 2. The bridge of the nose part can be adjustable. 3. Built-in foam pads at the nose part are suitable for all kinds of face with comfort. Suitable to long time wearing comfort. Cool latex-free cloth head straps for comfortable wearing. 4. Breathing valve reduces hot air inside and makes wearers breath easily in hot/humid environments. 5. A perfect protection against toxic particles, an efficient adsorption and removal of organic gases and odor. Usages: Suitable to textile, mining, construction, electronic, food processing, cement, disintegration, agriculture, farm garden, glass, cleaning, workshops,ect. Structure: Three layers: inner layer and outer layer are made of soft Polypropylene (P. P) which reduces the fiber falling and increases comfort for wearing. The filter layer is made of high-efficient melt blown cloth which resists dust and oil-free particle. Note: Can be used for about 8 hours to protect the wearers from particles and dust well but can not be used in protecting the gas. If you want this role, please choose our half face gas mask or gas mask.