This product has a filter efficiency of 95% or greater against solid and liquid aerosols free of oil.Manufactured by BYD Precision Manufacture Co., LTD (NIOSH Approval No. 84A-9221)The mask consists of three layers of high quality nonwoven materials: the outer and inner layers are made of polypropylene spunbond nonwoven fabric; the middle layer is made of polypropylene melt-blown nonwoven fabric.Provide soft, skin-friendly, comfortable wearing experiences and protection for daily usage.The foldable design can cover the nose and mouth with close fit to the face, providing respiratory protection against non-oil particles and reduce user exposure to certain airborne particlesThe elastic head straps are soft and gentle to skin, eliminating the pressure behind the ears even when worn for a long time. The built-in nose bridge is adjustable to ensure a comfortable fitting experience.Soft and comfortable to wear, skin-friendly; Fit for both indoor and outdoor application all-year-round for all 4 seasons