Made of advanced silicone material, the facepiece is soft and fits comfortably, molded in one piece for extended wear, long service life, and excellent oil resistance; bayonet assembly design allows for quick and easy installation and removal of filter cartridges/filter pads; adjustable head harness with polyester/spandex woven headband, compatible with safety helmets in headband suspension mode for easy donning and doffing; downward exhaust of warm, moist exhaled air without obstructing vision, exhalation valve diaphragm is resistant to contamination and easy to clean; available in multiple sizes; certified by China LA and US NIOSH.