Applicable Gender: Neutral (male / female) Adjustable size(L*W): 23*14cm/9*5.5inch Suitable season: autumn, winter Function: against PM2.5, anti-fog and haze, industrial anti-pollution, anti-vehicle exhaust, dust, secondhand smoke, pollen allergy, Cold Keep warm, etc Eleven choices for you(colors): wine red，navy blue，black，grey，pink,purple Features: 1,After wearing the mask, adjustable nose piece according to each person different nose shape to get fit with the face, so that the sealing effect is better, and the user wearing the glasses can effectively reduce the fogging after adjustment. 2,Breath valve design, The same position alternates twice, it reduces heat and moisture accumulation 3, the adjustable size of elastic earloop, so that more comfortable to wear comfortable. 4, the next along the intimate U-shaped design, increase the mouth and jaw comfort and sealing, does not affect the language of communication 5, insert the 5 layer filter PM2.5 filter （come with 2pcs PM2.5 Filter paper） 6, plug-in design 7, Soft, warm, good moisture permeability and wicking effect, it keeps the face dry and comfortable, lasting effect. Tips: 1, plug-in filter can not be cleaned, it is usually replaced once every 5-7 days. If the air pollution is serious, replace it once every 2-3 days. 2, the filter oil on the film or with sticky sediment stains are more, please replace the filter. 3, the air does not flow, poor breathing or sleep, the prohibition of use 4, children under the age of two prohibited the use of Cleaning method: 1, plug-in filter can not be cleaned ,it is usually replaced once every 5-7 days. If the air pollution is serious, replace it once every 2-3 days. 2, the proposed neutral detergent with water diluted, put the mask into the water(remove the filter), hand gently rub, dry in the airy shade 3, do not long soak in the washing liquid or water, to avoid the use of bleach 4, please arrange the cleaning cycle according to the use of the general recommendations 1-2 week cleaning time. Note: If you need more filters, please buy the filter separately in our store. Package: 1/2pcsX PM2.5 Filter paper ( 2pcs/packet )