Description:With acticarbon,it can prevent substance which is harm for human effectivelyFive layer filter system,give you breath more domReplaceable filters and exhalation valves to keep the inside of the mask well ventilatedIf long-term use,every seven days with a change

not commonly used,per month,changed onceSuitable for cycling, hiking, running, skiing, snowboarding, or climbingand other outdoor activitiesSpecification:Material: Activated Carbon, Non-woven fabricsSize(LxW): Approx

10x14

5 cm / 3

9x5

7 inchColor: GrayPackage Includes:1 Piece Cycling Mask FilterNote:Please allow slightly difference due to manual measurement

Color may be slightly different since different monitors

Thanks