S9 N95 Quality Mask with Silica based Base gives the perfect fit. Since there is no Cloth touching our face, Ddsintegration and threadout is eliminated. The S9 Mask comes with 12 changeable filters. One filter has a life of 240 hours. Thus average of 8 hours per day gives life time of 30 days per mask. Thus this mask with the 12 filters can be used for a complete year. 

S9 N95 Quality Mask with Silica based Base gives the perfect fit. Since there is no Cloth touching our face, Ddsintegration and threadout is eliminated. The S9 Mask comes with 12 changeable filters. One filter has a life of 240 hours. Thus average of 8 hours per day gives life time of 30 days per mask. Thus this mask with the 12 filters can be used for a complete year.