The Israeli gas mask adult with Filter (model 4A1) is lightweight, and specially designed for extended use with superior comfort, secure fit, and low breathing resistance. The model 4A1 gas mask respirator incorporates a uniquely designed peripheral sealing lip that offers a high level of protection for mature civilian users. The included filter for the Israeli gas mask has been tested by manufacturers; gas-life tests (cyanogens chloride, DMMP, chloropicrin, phosgene, HCN) have been done on charcoal samples from each drum, and on completed canisters sampled from each production lot. The gas mask also comes equipped with a 40mm sealed NATO standard filter that directly purifies the users breathing air. The provided filters circulate clean oxygen without risking exposure to airborne nuclear, biological, or chemical agents. The Type 80 is a robust, durable canister intended for military and/or civil defense use. It is specially designed for comfort and extended use at a minimal physiological load, having low breathing resistance and low weight. The Israeli gas mask design assures optimal performance complying with all IDF specifications.