• 3M™ reusable half masks for gases and vapors from the 6500QL series are designed with challenging and contaminated work environments in mind. • Thanks to the quick latch mechanism (QL), you don't need to remove your safety helmet or face shield when you want to take off or put on the mask. (Do not remove the mask unless you leave the contaminated area!) • Compatible with all 3M bayonet filters (series 2000, 5000, 6000) • Extended service life thanks to durable silicone material (the mask uses bonded silicone that does not release into harsh environments – the product is also suitable for paint shops) • Compatible with 3M welding and grinding shields