hmiao 3 pack pm2.5 dust mask, reusable breathing valve mouth masks, with 6 pcs pm2.5 activated carbon filter protection from dust, pollen, pet dander hmiao <b>3 pack pm2.5 dust mask, reusable breathing valve mouth masks, with 6 pcs pm2.5 activated carbon filter protection from dust, pollen, pet dander</b><br><br> <b>features:</b><br> 1. the adjustable elastic buckle makes comfortable wear.<br> 2. nose part design gives large space for free breathing.<br> 3. adjustable metal nose piece can get fit with different face shape and seal better.<br> 4. a 5 layer pm2.5 filter helps to prevent dusts and other small particles.<br> 5. fine polyester fiber provide soft, comfort and good moisture permeability.<br><br> <b>cleaning method:</b><br> 1. plug-in pm2.5 filter can not be cleaned, suggest to replace once a week.<br> 2. clean with neutral detergent.<br><br> <b>package includes:</b><br> 3 * dust masks<br> 6 * activated carbon filter<br>