Feature: 1.Made of high-quality space cotton material, with 3 thickened layers and high quality, breathable and comfortable. 2.Can be repeatedly washed and used; dustproof and durable. 3.Foldable, you can put it inside your pocket and bring it anywhere. 4.Comfy elastic wide ear loop lets you wear these masks for long periods of time without irritation. 5.Built-in exhalation valve lets air in and keeps moisture out, letting you breathe easier while keeping dust and other pollutants out. 6.3D design, in line with the facial contour, making thinner look. 7.It is suitable for cycling, running, biking, hiking, skiing, woodworking and other outdoor activities. Specification: Type: Face Mask Material: Space Cotton Applicable To: Adults and Children Style: Double/Single Valve/ without Valve Mask Color: Black Package Included: 1/3/5/10 x Face Masks