Material, Visor : The transparent chemical-protective clothing material that allows the wearer to see outside the CBRN terrorism incident protective ensemble and ensemble elements
NFPA 1994 Standard on Protective Ensembles for First Responders to CBRN Terrorism Incidents, 2007 ed. http://media.bmt.org/bmt_media/resources/39/NFPA19 94.pdf, (Std: Prot Ens for First Resp to CBRN Teror Incid - Amer) {438 NFC}