Designed for demanding and dirty work environments.When used with the appropriate 3M bayonet connection filter, they can protect against hazardous gases, vapors and particles.The quick - opening mechanism with locking mechanism allows the mask to be easily removed and put on.Bayonet - type connection compatible with a wide range of filters Comfortable, durable and stable, soft but firm sealing facepiece made of resistant silicone.Exhalation valve cover helps direct exhaled air and moisture downward 3M™ Cool Flow™ valve allows easier breathing and reduces heat and moisture buildup Low profile half mask offers a wider field of vision Adjustable headgear assembly offers improved fit and comfort Can be used with 3M™ air delivery systems for added comfort and flexibility Small size The reusable 3M™ 6501QL half mask is rugged in design and has a stable silicone face fitting piece.This small 6500 series half mask features a bayonet - type connection compatible with a wide range of filters and includes a 3M™ Cool Flow™ valve and an exhalation valve with cover. It has a low - profile design with an adjustable headgear and quick - release mechanism with latch. If you need comfortable respiratory protection for working in demanding and dirty environments, use the reusable 3M™ 6501QL half mask. This small size half mask is durable, heavy - duty design with a stable, soft but firm silicone facepiece.The quick release locking mechanism allows the mask to be removed and put on easily when moving between safe and contaminated areas. This means you don't have to remove your helmet or face shield to lower or raise the mask. The half mask design with low profile face piece offers a wider field of vision and better compatibility with welding or grinding shields. Adjustable headgear assembly offers more comfort and fits well with 3M helmets and hearing protection. With bayonet - type connection system, compatible with a wide variety of filters that protect against gases, vapors and particulates. The 3M™ Cool Flow™ valve allows for more comfortable breathing by reducing heat buildup, and the exhalation valve cap helps direct exhaled air and moisture downward to reduce fogging of welding and grinding goggles and shields.It can be used with 3M™ air delivery systems for added convenience and flexibility, and with all 3M™ 2000, 5000 and 6000 Series filters (except 3M™ 6098 and 6099 models). The 6500 Series has a range of replacement parts and accessories specially designed to help you maintain the right level of protection and comfort when parts become worn or damaged.