For person who weights : Large ::: 130-190 lbs / 59-90 kg Chart is Accurate Vogmask a particle filter mask that filters smoke, dust, and other air pollutants that might irritate the lungs. Filters 98.98% of Air Pollution Filter is Rated at N98. 50% more breathable compare to previous N99 model Particle Filter with Carbon Active Filter Updated: Vogmask blocks 98.9% of air borne pollution. The new updated filter is 50% more breathable compare to previous N99 Vogmask model. Vogmask has a higher filterate compare to N95 VMC FEATURES ~ Superior protection for particles in air pollution and other microscopic airborne contaminants. Trim and ear loops are made with latex-free spandex. Carbon filter helps with odors. Particle filter is efficient for inflow and outflow of droplets. Vogmask VMR, VMC, and Organic VM are NON VALVED filtering masks. Vogmask VMR is printed outer layer with middle layer of highly efficient reusable particle filter for >95% of microscopic particles and inner layer of woven microfiber. Vogmask VMC is printed outer layer with middle layers of particle filter and carbon filter and inner layer of woven microfiber. Vogmask Organic VM is certified cotton outer and inner layer with middle layer of highly efficient particle filter. Non valved Vogmasks filter inflow and outflow. Vogmask is a reusable filtering mask with two layers of filter media, sewn into middle of the mask: a carbon filter; and highly efficient particle filter for protecting from inhaled microscopic particles including dust, pollen, shavings, mold, biologics, and contaminants in poor air quality. See Technical Specifications on home page: https://www.vogmask.com/pages/technical ECO-FRIENDLY ~ Vogmasks are reusable and made from sustainable materials. Average replacement time is one year. Test Documents Sodium Chloride (NaCI) Aerosol Test Final Report https://cdn.shopify.com/s/files/1/0250/0840/files/Nelson_Labs_Particl_Penetrations_NaCl_1101889-S01.pdf?8699031093377030261 Determination of Inhalation and Exhalation Resistance for Air-Purifying Respirators Final Report https://cdn.shopify.com/s/files/1/0250/0840/files/Nelson_Labs_Inhalation_Exhalation_1101891-S01.pdf?8699031093377030261 Determination of Valve Leakage for Air-Purifying Respirators Final Report https://cdn.shopify.com/s/files/1/0250/0840/files/Nelson_Labs_Valve_Leak_Test_1112597-S01.pdf?8699031093377030261 Viral Filtration Efficiency (VFE) Final Report https://cdn.shopify.com/s/files/1/0250/0840/files/Nelson_Labs_Viral_Filtration_1112598-S01.pdf?8699031093377030261 Bacterial Filtration Efficiency (BFE) Final Report https://cdn.shopify.com/s/files/1/0250/0840/files/Nelson_Labs_Bacterial_Filtering_1112599-S01.pdf?8699031093377030261