✅CERTIFIED KOREAN KF94 MASKS: This kf94 mask is made with high quality MB fabric that is effective in preventing particles. Made with a triple-layered electrostatic filtration system, this product will filter at least 94% of PM2.5 airborne particles to protect the wearer from exposure to pollutants. ✅ EASY BREATHING : Goodday KF94 certified masks fit securely on your face so that you can breath easily and keep the mask on all day without discomfort. ✅ OUTSTANDING QUALITY CONTROL: Produced by the company specialized in mask manufacturing: Using the High Quality Filter (MB) created by the innovative technology the company, HAPPY LIFE Co., Ltd. recognized for its excellent technical skills as textile and fabric manufacturer. ✅ COMFORTABLE FORM FITTING DESIGN : Goodday masks have a 3D flat-fold(tri-fold) design that prevents air leakage. Use the nose bridge The adjustable nose bridge helps to ensure a secure fit and stays on your face without slipping or falling off. The perfect fit prevents fogging up your glasses. ✅ KFDA APPROVED: Goodday safety masks are manufactured in South Korea. The masks are KFDA approved.