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The series 8300 pre-formed mask has many comfort features which combine reliable protection and high comfort for the wearer. A long working life is achieved by the use of high-quality components such as textile web straps and a stable mask body. The M-shaped nose clip quickly and easily adapts to all nose shapes. The accumulation of heat and moisture within the mask is avoided by use of the 3M™ Cool Flow™ exhalation valve. The particularly soft inner fleece ensures safe and comfortable seating. Low respiratory resistance due to the high-performance filter medium.