This optional filter is made from a high-quality furnace filter rated to protect from allergens, bacteria, and viruses. Does it protect against COVID-19? I'm not a medical expert or scientist, so I cannot say. Is it an added layer of protection for you and your loved ones? I think so. Your choice — these are optional. If you order a filter, we will open up the filter pocket for you. Watch the "How to Wear a Mask Maker WI Mask" video on our home page to show you how to insert it.