The BASE CAMP Dust Breathing Mask is one of the most popular in the market The mask made of nylon is lightweight, cool, and comfortable, effectively filters out 99.6% of chemicals, exhaust, and dust, pollen, smoke, and fumes. It’s a reusable mask that often comes with 6 extra filters. ●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 Performance, Activated carbon, Non-woven Polypropylene ●Activated carbon filters isolate non-toxic dust, fumes, common airborne irritants and other non oil based particles Ergonomic Design: ✔ Fully formable nose clip ensures effective seal and prevent fogging ✔ Hook and loop combined with elastic band system to easily extend or shorten the neck band to fit your neck comfortably ✔ Dual one-way airflow vent expels condensation keeping the masks with filter interior dry User-friendly Experience: ✔ M Plus dust mask woodworking 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 mask shell and valves can be washed for next use when they get dirty, the filter is replaceable 1-The respirator 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-The already attached filter is an example showing how to install and detach only, please replace it with new filter when wearing 3-While the design of our dust mask woodworking make every effort to prevent fog your glasses, we cannot promise 100% no fogging.