Level A is fully encapsulated chemical protective clothing that is vapor-tight and liquid-tight. This suit has incorporated gloves and boots and a gas-tight zipper. The responder will have the self-contained breathing apparatus (SCBA) inside the suit.

Level A ensemble consists of:

• Encapsulated suit with attached gas-tight gloves and boots
• Inner and outer gloves
• SCBA
• Overboots
• Helmet (optional)
• Communication system (optional)
• Cooling system (optional)

Level B is protective clothing associated with splash protection. Level B requires the use of an SCBA outside the suit. Level B ensemble consists of:

• Level B suit
• Inner and outer gloves
• SCBA
• Outer boots
• Helmet (optional)
• Communication system (optional)

Level C suit is used where splashes may occur, but where respiratory hazards are minimal and are covered by the use of a powered-air-purifying-respirator (PAPR) or air-purifying-respirator (APR). Level C ensemble consists of:

• Level C suit
• PAPR or APR
• Helmet
• Inner and outer gloves
• Outer boots

Level D is work clothing, which may include helmet, safety glasses, work clothes, safety shoes/boots, and chemical/work gloves.