The virus is generally contained within a much larger droplet that is expelled when a person speaks, coughs, or sneezes. So the 120nm number is not necessarily relevant.

As I wrote:

Bacteriophage MS2 - 23nm :

Surgical mask 89.52% filtering

Tea towel one layer 72.46% filtering

-> Thus still ~70% filtering of 23nm particles for the one layered towel. They didn't put the number for a two layered towel in there, I wonder if it did beat the surgical mask.