face mask

./florence-roro.pdf

mods

retro-reflective pattern

ir-reflective insert

see also

https://www.webmd.com/lung/coronavirus-face-masks

https://www.regmedctr.org/webres/File/OlsonMask_wPattern_v3-USE%20THIS%20ONE.pdf

https://www.uhhospitals.org/-/media/Files/Coronavirus/MaskProductionGuidelines03282020v6.pdf