1. Adjustable plastic buckle for convenient length adjustment
2. The high-grade foam inner ring makes wearing more comfortable and ensures a tight seal without leakage
3. High-elasticity elastic band, elastic elastic band design, comfortable and not tight
4. Breathing valve design, cold flow breathing valve, smooth exhaust without stuffiness
5. Application: It is suitable for places such as food processing industry, cement plants, textile factories, and stone processing.
