These masks are intended to be used for protection against solid and liquid aerosols in wood, cement, glass working, textile, mining and construction environments. They are extremely durable, and they have a soft inner surface with an adjustable nose piece and a secured head straps for a proper fit. This mask is designed with low breathing resistance filter media to increase user comfort. All FFP1 masks are to be used in situations up to 4 times the Occupational Exposure Level (OEL). The exhalation valve reduces breathing resistance and provides greater comfort.