Sperian Survivair Opti-Fit CBRN mesh head net Gas Mask comes with a durable, chemical resistant butyl rubber face skirt. The field of vision is great especially since there isn’t anything obstructing the user’s view. This Sperian CBRN gas mask has a polycarbonate lens which is distortion free and a nose cup to prevent the lens from fogging up. The filtering canister can be mounted in three different locations of the mask which makes it adaptable for various applications. Attaching and removing the canister off of the mask is very easy since it comes with DIN-threaded 40 mm connectors. Sperian CBRN gas mask is compatible with canister model 168800 and 169000. Durable, chemical resistant butyl rubber face skirt. Anti-scratch coated polycarbonate lens. Three position canister mounting. Nose-cup to reduce fogging. DIN-Threaded 40 mm connectors.