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      There are many factors that contribute a decision in what makes the best mask for you. Often the primary aspects are comparing "breathability" to filtration efficiency, and how the masks fit. We can give guidance on breathability, but it is harder to suggest a fit due the different sizes of faces that will be wearing the mask. 

      Metro

      Active

      FIT Very Good
      Excellent
      FLOW Very Good Excellent
      PFE Excellent Average
      TECH ZioShield ZioShield
      PRICE $32 $25
      USE Travel, Meetings, Commute, crowded environments  Sports, Outdoor activities, low-risk environments  
      SIZE 8" W x 5.25" H (Regular) 8" W x 5" H