Reliable and Breathable material: The dust filter is comfortable and breathable, and can breathe smoothly even if worn for a long time. Professional-grade Face filter: Perfectly cover your nose, mouth and chin, and block particulate dust from daily life to provide comprehensive protection. Comfortable Elastic Earloop: The mouth filter fits the skin of the face, leaving no place for dust. Super soft earloop eliminates pressure on the ear. Exquisite Tailoring: The edges of the product are laminated with multiple pressures to make the item strong and durable, without foreign body sensation, comfortable and burden-free. Storage Time: 2 Years.