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2 Size for choice:Large fits most adults and X-Large is a best fit for larger faces. Adjustable cover can fit snugly to the facial arc and prevent slipping.
3 Layer design：First layer-100% polyester, Second layer-cotton blend, third layer-nanofine cotton blend – soft against the skin,comfortable to wear.
With activated 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 5 pieces Cotton Blend protective covers,10 pieces replaceable filters.