[zipedit] Reusable Cotton Mask with PM2.5 Filter Valve - The economical and comfortable cotton mask is washable and reusable compared to those disposable ones. With the activated carbon PM2.5 filter, it can block 95.99% harmful particles such pollution, gases, dust, pollen, germs, bacteria, viruses etc.. The breathing valve design lets air out more easily, which makes breathing more comfortable. It also keeps the mask less sweaty. The cotton reusable mask is made of 5 layers including dust-proof cotton cloth, melt-blown nonwoven fabric, electrostatic nonwoven cotton filter, high-density breathable cotton cloth The PM2.5 filter is made of 5 layers including nonwoven fabric, melt-blown fabric, activated carbon. The cotton mask can be hand washed with soap and hot water. The PM2.5 filter can be replaced. You can normally use it for up to 7 days but we do recommend to cut down to 3-4 days. Breathing valve: when exhale, it automatically opens the valve, and discharges smoothly. When inhale, the valve automatically closes to prevent the harmful contaminants in the air to enter. Adjustable invisible nose bridge and ear loops. After wearing the mask, press the strip around the nose bridge to fit the face shape, in order to prevent contaminant infiltration. Size: Length x width = 20cm/7.9'' x 14cm/5.5'' Offer: 1 cotton mask comes with 2pc PM2.5 Filter Unisex Note: Please choose carefully as we aren't able to offer refund for hygiene issue.