... and three layers are all availalbe. 2) Other activated carbon mask Nonwoven face mask3W-89221) Single layer, double layers and ... three layers are all availalbe.2) Other activated carbon mask available.3)soft,comfortable,availabel to adjust nose4)one-time ... layers and three layers are availableSoft, comfortable ,available to adjust nose . the aerosal of harmless gas , including dust, fume, droplet, ...