good filter system and durable quality
1. Fold flat easy storage and transportation in a pocket.
2. Three layers, each layer is made of soft Polypropylene(P.P.) inner layer, reduce the fiber drops and increase the wearing comfort.
3. The filter layer is made of high efficient melt blown web which resists dust and oil-free particle.
4.Adjustable plastic nose clip fr comfortable fit.
5. Cool latex-free head straps for comfortable wearing.
6. Easy-breathing exhalation valve.