Reusable and Washable - The package including 1 Cloth Cover + 4 Valves(2 built-in and 2 replaceable valves) + 7 Filter Pads(1 built-in and 6 replaceable filters). The outer layer is washable, please wash it first before using. The inner layer filter pads and the breathable value are replaceable.
Designed with Breathable Values - The valves will be open when breathing out and close when breathing in. It is more comfortable to use than the one without the value.
Perfect for Adult Men and Woman - Velcro straps make it easier to wear and the adjustable & elastic earloop fits most adult people's nose and mouth. To prevent the dirty air, dust coming inside.
Protection in Indoor and Outdoor Activities - Perfect for outdoor sports and must-have indoor activities, such as running, jogging, motorcycling, cycling, biking, riding, skiing, hunting, climbing, camping, fishing, painting, meeting, working.