1. Fashion design Unisex black, stylish design. It protects you while making you look very stylish and beautiful. 2. The built-in exhalation valve allows air to enter and maintain moisture excretion, making your breathing easier, while avoiding dust and other pollutants from entering. 3. It can be cleaned and reused. It should be cleaned before first use. The machine was cold washed. Don't bleach. Do not dry clean. Foldable, easy to carry. 4. More comfortable: belt and adjustable nose clip. The dust-proof belt is not easy to slide, the adjustment size is more comfortable, and it is more suitable for the head shape. Prevent fogging 5. Reminder: The protective cover and valve can be cleaned when they become dirty. We recommend changing the filter once a day for better results. Package includes: 2/4PCS mask + 30/50/100/200PCS filter I wish all customers a happy shopping☺