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black adult dustproof famask breathing valve wecan mask washable reusable anti-dust fog pm2.5 masks filter shipping z.features: material:skin-friendly material makes it feel comfortable when you wear it. double filter: 4 layers thick preventing dust perfectly. high quality: its extensible and stronger is not easy to be damaged. widen elastic ear-loop: with stretchy widen ear-band for closely fit, easy to wear and off.