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Despite the ongoing rollout of coronavirus vaccines, masks remain a critical tool to reducing the spread of COVID-19. But the pandemic has put a premium on both the quality of face masks and the number of them—wearing more than one mask is now becoming a popular habit as more infectious variants of the virus crop up around the United States. Research suggests double-masking can bolster protection, making for a better fit over the mouth and nose with less open space at the edges. At the same time, there is a shortage of clinical-grade personal protective equipment (PPE) in multiple regions.