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The face masks have two layers of fabric. It is possible to add a filter, an extra 3rd layer. The elastics can be adjusted. The masks can be washed at 60 degrees. They have a piece of metal, like the disposable face masks, which you can adjust so the mask fits properly and do not fall down so easily. The face masks are not intended to act as a medical device or other medical product, and should not be used as a replacement for conventional and approved personal protective equipment, including surgical masks or respirators.