The Universal 2525 mask is made from two layers of 100% cotton in two different densities. The outer layer is less dense and designed to block larger particles, while the white inner layer is denser and designed to block smaller particles. The specially woven fabric makes the 2525 highly breathable and helps it efficiently disperse moisture. This makes the mask comfortable and cool for daily wear, all day long. Two breathable cotton layers, a sturdy and adjustable nose bridge, 3-D design that fits the contours of your face, and stretchy, adjustable elastic ear loops, all work in unison to make the Universal 2525 cloth mask a snug but comfortable fit every time. A mask that fits properly will allow only a very minimal amount of unfiltered air to enter or escape, and it will minimize fog buildup on your or your child’s eyewear. The Universal 2525 is ideal for many daily activities, including but not limited to: running, walking, jogging, cleaning, dusting, playing, school activities, and much more. It protects your child’s mouth and face from dust, ash, pollen, grasses, weeds, passive smoking and other airborne pollutants. The Universal 2525 is a three dimensional mask. It is manufactured from two layers of specially woven cotton. Each layer is woven to a different density and filters different sized particles. This design allows the mask to conform to the shape of your face and seal tightly with minimal gaps. These features greatly improve the quality of the air coming in and going out. Package of 4 washable, reusable masks. Universal 2525 Cloth Face Masks for Kids - 5 Color Assortment - Washable & Reusable Facemask for Nose & Mouth - 100% Cotton, 2 Layer Protection from Dust, Pet Dandeer & Airborn Allergens