Nose, mouth, chin zone: PROLEN®Siltex antibacterial fibres containing silver ions can filter small particles from air. Cheek zone: knitted mesh allows for air circulation. Soft, lightweight and breathable, very comfortable to wear and ideal for people with skin sensitive allergies. Ear loops sit nicely behind the ear and can be worn for hours. Reusable: PROLEN®Siltex retains its antibacterial properties for 20 washes. This mask lets air in easily and keeps moisture out, letting you breathe easier whilst keeping dust and other pollutants out. Individually bagged. PROLEN®Siltex is a polypropylene yarn treated with a tested and certified permanent antibacterial additive, based on silver ions. Multi-purpose: reduces the risk of breathing gases, harmful odours, pollen, smoke, dust and other harmful particles for hospitals, schools, travel, cleaning, painting, construction or outdoor activities.