Unique selling proposition EAPI Filter Technology： ●EAPI Filter Technology: Electrostatic Adsorption & Physical Interception, Advanced Nanotechnology ●6 layers Face Mask, consistent high performance ●Filter materials of the dust mask: Double-Layer Melt-blown with Electrostatic Adsorption Perfermance, Activated carbon, Non-woven Polypropylene ●Activated carbon filters isolate non-toxic dust, fumes, common airborne irritants and other non oil based particles Ergonomic Design: ✔AEB system helps remain the adjustable face mask securely on your face for comfortable fit, relieve pressure on nose and ears and create a tight but comfortable seal ✔ Fully formable nose clip ensures effective seal and prevent fogging ✔ Earloop design keep the reusable face masks from slipping ✔ Adjustable hook & loop strap for optimal fit ✔ Dual one-way airflow vent expels condensation keeping the breathable face mask interior dry User-friendly Experience: ✔ M Plus dust face mask shell allows the face to breathe and feel cool in hot and humid conditions ✔ Have the one-way valves downward-facing to maximally avoid exhalation fogging up your glasses ✔ The M Plus mesh face mask shell and valves can be washed for next use when they get dirty, the filter is replaceable NOTE: 1-The adult face mask shell is just a holder of filter, it's the inner filter that performs the filtration of non-toxic dust, fumes, particles, etc. 2-While the design of our washable face masks make every effort to prevent fog your glasses,we cannot promise 100% no fogging. 3-To be safe for you and others, It is recommended that you check and tighten the valve before wearing the mask to avoid the valves falling off accidently. 4-Comes with reusable zip lock packaging bag, please carefully seal the packaging bag after putting out or in your dust mask to protect masks and filters.