self-priming mask k3 anti-dust mask windproof bacteria-proof anti-spitting cover mask

eco-friendly ,soft and fitful to face ,comfortable without leaving marks on face.elastic earmuffs without pressure on the ears. three layer protection,high filtration capacity. resusable mask:change the filter cotton only. bionic breathing valve + mask vent,double ventilation for more comfortable breathing . effectively filters all the following pollutants: pm2.5 ,smog ,droplets,pollen allergens,pet hair allergy,second-hand smoke ,kitchen fume,automobile exhaust and industrial dust.