Nanofiber filtration layer that does NOT rely on static electricity for functionality of filtration efficiency 12 YEAR SHELF LIFE FDA 510k cleared mask CE FFP2 NR certified mask (Certification No: 2163-PPE-1433) High breathability using nanofiber technology Strong moisture control with 0.1 m filtration efficiency Lightweight design with each mask weighing less than 4.38g 3-layer ergonomic design covering nose to chin Functional nose support with a wired flexible fit Firm mask structure prevents falling off and fogging of glasses Flexible nylon straps that maintain elasticity after long use Made in South Korea using patented manufacturing processes with ISO certified facilities BFE / PFE 97% Test Agent NaCl and paraffin oil Flow Rate 95 L/min T.I.L 2.5% leakage Inhalation Resistance 33 Pa (at 30 L/min) Max Pressure 112 Pa (at 95 L/min)