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These robust half-masks of silicone-free natural rubber can be adjusted by a flexible ″drop-down″ strap so that during breaks in work they lie conveniently on the chest. Due to the silicone-free material is the mask particularly suitable for painting work. Double filter system for reduced breathing resistance and good weight distribution. The structured face seal ensures a good seal seating. Patented CoolFlowTM exhalation valve.