Get extra protection with this fashionable Panthra face mask. The face mask comes with 2 carbon PM 2.5 filters you can easily insert into the mask. It concerns special particulate matter filters (PM is short for Particulate Matter, 2.5 for a fraction of dust particles with an aerodynamic diameter smaller than 2.5 µm.) This filter consists of 5 different layers so it also protects against fine particulates. Think about condense and mist, industrial pollution, exhaust, dust, second-hand smoke and even pollen. The filters are for single use and can be used for up to 8 hours. You could of course cut a new filter that fits the face mask, but it works great without a filter as well. The face mask has adjustable loops which makes it comfortable around the ears. The face mask is machine washable at 60 degrees. How do you use PM 2.5 filters Before you remove the filters from the package, it\'s important to wash your hands thoroughly. Think about the 20-seconds rule to wash all bacteria from