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Protective cover are made of high quality cotton material,easy breathing,keeping you breathe easier while wearing it.
Adjustable straps and nose bridge can fit snugly to the facial arc and prevent slipping,comfortable to wear.
With breathing valve and a ctivated carbon filter,these can be used to protect you from harmful dust particles,PM2.5,vehicle exhaust,woodwork,pollen allergies,etc.
Suitable for sports,running, home,outdoor activities and daily use.
Package Includes 4 pieces cotton protective covers,10 pieces replaceable filters.