Specifications: Mask material: diving Fabrics Inner cover material: Non-woven, activated carbon Filter material: activated Carbon Color: Blue,Red,Black Size: average size,stretchy and adjustable Style:Activated Carbon Mask Season:Spring,Summer,Autumn,Winter Features: -Active carbon filters isolate 95-percent of dust, chemicals, fumes and particulates, especially for those who in pollen allergy have a significant role. - The perfect combination of ergonomics, size can be adjusted to meet the most head type. According to the person face design, keep out the bridge of the nose the following part, have aluminum sheet fixed, to prevent the slide. -Unique ventilation design, a plurality of holes, excellent permeability, Exhale,the valve is opened without resistance,double air breathing valve, air resistance is smaller,smooth breathing. - Suitable for running, cycling, hiking, skiing and other outdoor activities,it also can be used haze day protection, anti-dust and so on. Package Included: 1 x Dustproof Mask Note: 1.Please allow 1-3cm error due to manual measurement. Please make sure you do not mind before you bid. 2.The colors may have different as the difference display, please understand.