Size: MediumHalf-Face DesignResilient Silicone Faceseal Provides Comfort, Durability And Stability With A Soft But Firm SealQuick Latch Mechanism Makes It Easy To Drop Down The Respirator From Face Without Removing Head StrapsProprietary 3M Cool Flow Valve Helps Reduce Heat And Moisture To Make Breathing Easier And Directs Downward To Reduce Fogging Of Face ShieldsLow Profile Design Offers A Wide Field Of View And Compatibility With Welding And Grinding ShieldsNIOSH Approved For Negative Pressure Air Purifying And Supplied Air Dual Airline Applications