Safety Without Compromise. United States Mask was founded in early 2020 at the beginning of the global outbreak of COVID-19. Its co-founders quickly realized the bigger issue of our country's reliance on other nations for critical personal protective equipment. By manufacturing NIOSH-certified N95 respirators here in America from US-sourced materials using state-of-the-art custom machinery, United States Mask is able to ensure that its PPE is reliable, safe, effective and affordable.