Plastic nose bridge, anti - air leakage, anti - fog. For the polyline design, ultrasonic production, durable face mask. Five layers of protection, safety and purification create a safe experience, multi-layer material composite structure, more efficient filtering. 1: Can contact the skin layer, adsorb dust odor and harmful substances. 2: Moisture absorption and sweat diversion layer to strengthen the filtration of fine particles. 3: Melting spraying cloth (1) filtration efficiency ≥95% 4: Melting spraying cloth (2) : filtration efficiency ≥95% 5: non-woven cloth protective layer, moisture-proof and breathable filtration