Chemical, biological, radiological, nuclear and explosive (CBRNE) events refer to the uncontrolled release of chemicals, biological agents or radioactive contamination into the environment or explosions that cause widespread damage. CBRNE events can be caused by accidents or by terrorist acts. They are normally made up of  reinforced nylon with charcoal impregnated felt.

Chemical, biological, radiological and nuclear defence (CBRN defence or CBRNE defence) are protective measures taken in situations in which chemical, biological, radiological or nuclear warfare (including terrorism) hazards may be present. Each one provides FR, liquid and vapor protection and is completely reusable as long as you’re not exposed or contaminated.