Gives the characterisitcs of two types of clothing: ventilated-pressurized garments and unventilated-unpressurized garments. These characteristics include the manufacture materials, design and size, accessories, breathing air supply and internal ventilation. Annex A describes a test method according to which any new type of garment can be assigned a protection factor that makes it easier for the user to make a choice. Annexes B and C give methods for measuring leak tightness and air supply flow rates of ventilated-pressurized garments. Annex F gives, for guidance, recommendations for choosing protective clothing.