These 3D 3-Ply Reusable face masks are specially design with comfort in mind. Two center stitching are designed to fit the nose and chin better. Our skin is constantly irritated by the friction caused from wearing masks. The WENS masks are made with cotton microeyelet, which feels like sports jersey with slight stretch and soft touch to minimize skin irritation such as rashes or acne caused by wearing masks. The adjustable ear loop allows you to adjust the mask to fit smaller faces. Only available on the blue masks, the adjustable ear loops made it comfortable enough to fit a child as young as 8 years old. If you are in a crowded area or need extra protection from pollen, dust, haze or smoke, simply pop in the replaceable PM2.5 filter. These 5-ply filters includes a layer of activated charcoal cloth.All masks comes individually sealed and untagged because they are homemade in Malaysia.