What are the characteristics of disposable mask materials and how to use them?

Everything has its two sides, and the same is true for disposable masks. While it has advantages, it also has some disadvantages:
Advantages: very good ventilation; can filter toxic gases; can keep warm; can absorb water; can be waterproof; stretchable; will not be disheveled; feel very good and quite soft; compared to other masks, the texture is relatively light; Very flexible, can be restored after stretching; relatively low price, suitable for mass production;
Disadvantages: Compared with other fabric masks, disposable masks cannot be cleaned; because the fibers are arranged in a certain direction, they are easier to be torn apart; compared with other fabric masks, the strength of disposable masks is lower. The durability is worse than other masks.
Instructions
1. Wash your hands before wearing a mask.
2. Hold the ear strap with both hands, put the darker side on the outside (blue), and the lighter side on the inside (white suede).
3. Put the metal wire side of the mask (a small hard piece) on your nose, pinch the metal wire according to your nose shape, and then pull the mask body completely to make the mask completely cover the nose and mouth.
4. Disposable masks are generally replaced within 8 hours and cannot be reused.