breathing valve anti dust face mask folding without valve protective dustproof pm2.5 face masks ing

reusable face mask with breathing valve with filter replaceble fashion protective mask filter pm2.5 washable in stock pure cotton, face protection, light and breathable, skin-friendly, adjustable elastic band, insert 5 layers of pm2.5 filter;uses: anti-odor, anti-dust, anti-gas, anti-bacterial, anti-pm2.5.