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wecan dustproof pollution half famouth mask with breath valve wide straps washable reusable muffle outdoor masks ffa3889-9 4.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.