Further reading/resources:

• CDC's Mask Guide
• Badger Seal (Mask Fitter, Mask Sealer, Mask Brace)
• Strategies to minimize SARS-CoV-2 transmission in classroom settings: Combined impacts of ventilation and mask effective filtration efficiency (medRxiv)
• Maximizing Fit for Cloth and Medical Procedure Masks to Improve Performance and Reduce SARS-CoV-2 Transmission and Exposure (CDC)