Wu also claims the filters are undersized, which would cause air to leak in, going against Razer's promises that the mask has a tight seal. In fine print spotted by PC Mag, Razer says that the Zephyr and Zephyr Pro masks "are not medical devices, respirators, surgical masks, or personal protective equipment (PPE) and are not meant to be used in medical or clinical settings." We also can't confirm if the masks have been certified by the FDA.