Castle Grade G-Series face masks are the next generation in protection. Our soft silicon respirator masks provide: - Superior protection with an N95 rated replaceable filter with Nelson Labs tested BFE of 99.8% - Superior comfort with a soft silicon seal reducing skin irritation and ensuring air does not escape, preventing glasses from fogging - Environmental sustainability as our masks are reusable and avoid waste Our mission is to provide the next generation of protection for front line workers, healthcare professionals including doctors, nurses, dentists and other clinicians or anyone exposed to new risks during the COVID-19 crisis.