1. It can be recycled and the filter element can be replaced. 2. Five layers of protection, effectively filter odor, foul odor, second-hand smoke, allergens, PM2.5, dust, bacteria, etc. 3. Food-grade liquid silicone, strong sealing, anti-aging, non-fading, corrosion resistance, high and low temperature, soft and comfortable 4. High softness silicone lanyard, approximate skin hardness, let the mask produce a "follow-up" veneer, freely adjust the degree of comfort 5. Electrostatic cotton filter with super dust-holding capacity 6. A variety of filter elements, suitable for different seasons, environments and working scenarios
