Ultra comfortable cotton fabric Breathing valve for easy use Adjustable ear straps to fit most sizes 3 layers of protection from dust, germs, and viruses Reusable PM2.5 insert pocket Filtration 94.99% with use of PM2.5 charcoal filter (optional, sold separately - item #3805) Returns Policy PPE Personal Protective Equipment - we cannot accept any returns on this merchandise due to the nature of the product.