The 2 layers 3D face masks are made from comfortable elastic fabric, 180g elastic polyester, and 180g silk spandex polyester. The silk fabric, also called ice silk, is smooth, cool, and comfortable, it would give you a nice and cool feel in the hot summer. And the 3D design makes it more fit to your face. It is soft, breathable, and comfortable to wear all day to protect your mouth and face from dust, ash, pollen, grass, vehicle exhaust, passive smoking, and other airborne pollutants.
Please be noted that this is NOT a medical rated mask, it is meant for everyday civilian use. And it is not recommended to wear a face mask while you are doing exercise.