... "only out not in",for breathing easy and eliminate the exhaust gas in mouth.*Excellent water repellent and air permeability*Maintenance/ ... chemical, sterilizing, spray, agriculture, solution cleaning, painting, ink and dyeing, electronic, food processing, workshops, etc.*packing:20pcs/box,20boxes ... ,irritating,stimulant or poison,and glass fiber free.B) All products are made in our dust-free workshop.C ...