. Three-layer protection: outer Non-wovens + filter paper layer + inner soft fiber. Breathable and comfortable, low breathing resistance.
2. Plastic strip of the back of the nose that hides the side of the nose's back. More suitable for all face shapes.
3. Highly elastic flat ear strap. Does not burden the ears.
4. Inner layer: skin-friendly nonwoven. Soft and comfortable reduces the possibility of skin irritation.
5. Physical ultrasonic welding, welding point encryption, robust and durable, fine processing.