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1.
Short for Hazardous Material suit. A suit with the purpose of keeping the wearer safe from surrounding hazardous material.
Such as gas, viruses and radioactivity to name a few.

The suit covers the entire body and includes a mask.
These enable the wearer to proceed into dangerous areas contaminated by lethal air and material.

When leaving the area which contain the lethal substance, the suit is decontaminated by spraying neutralizing liquid on the suit before the wearer can leave the zone.
Man in charge - "The area is contaminated by a lethal substance, noone enters without a Hazmat suit."

"As to make sure the virus does'nt spread, a Hazmat suit is required to enter the area."
by Loktaei May 14, 2011