The CB10579 gas mask is uniquely designed and directly canister-attached gas mask capable of effective protection of the user's facial skin, eyes and respiratory organs in the CBR contamination environment, the face piece of the mask if suitably soft, voice-transmissible, and with a reliable in-turned seal lip to fit the wearer's face and adjustable elastic head-harness straps to ensure comfortable wearing and face sealing. Triangular, cylindrical lenses are made of optical plastics and especially surface-treated to incorporate good optical properties, and wear and shock resistance.