Critical Aerosol Theory on X: "3M VFlex 9105 and Flo Mask. Breathable summer options. https://t.co/xer5vEzdLZ" / X
David Elfstrom on X: "Got a box of 3M VFlex 9105 #N95 respirators. Very comfortable, large surface area, easy to shape, VERY easy inhale. It seems to retain more heat from my