Secure Click HF-800 half mask, without filter, size M. Model = reusable. Area of application = industry, trade, building construction, car industry, chemicals handling, agriculture, oil and gas, transport. Colour = dark blue. Size = M. The 4-path air flow filter system ensures it is easier to breathe due to low breathing resistance. Unique, fast and secure Secure Click filter connection. Seal check by pressing a button provides assurance that the mask fits tightly. The 3M Secure Click HF-800 half mask series has been designed to provide effective and comfortable protection against many widespread gases, vapours and particulate matter found in industrial environments when used in combination with the corresponding range of filters. The masks are available in three sizes and are optionally equipped with a speaking diaphragm (HF-800SD) to make communication easier while working. Low breathing resistance: the world's first 4-path air flow filter system makes breathing easy and comfortable.