First link that I come across:
https://www.cdc.gov/coronavirus/2019-ncov/science/science-briefs/masking-science-sars-cov2.html - obviously a bit dated (post-Delta, pre-Omicron) but not to any disadvantage of its accuracy.
Relevent snippet.
Multi-layer cloth masks block release of exhaled respiratory particles into the environment, along with any microorganisms associated with these particles. Cloth masks not only effectively block most large droplets (i.e., 20-30 microns and larger), but they can also block the exhalation of fine droplets and particles (also often referred to as aerosols) smaller than 10 microns which increase in number with the volume of speech and specific types of phonation. Multi-layer cloth masks can both block 50-70% of these fine droplets and particles and limit the forward spread of those that are not captured. Upwards of 80% blockage has been achieved in human experiments, with cloth masks in some studies performing on par with surgical masks as barriers for source control. In one study, conducted prior to widespread circulation of the Delta variant, masks worked equally well for blocking aerosolized particles containing both “wild-type” virus and the Alpha variant (a more infectious variant).
Not as good as full respirators, though those may be optimised for wearer protection (see next section on for Filtration for Wearer Protection), and perhaps a practiced fitting of a surgical mask (also more meant to prevent outwards transmission) is better too, but still much better than nothing.
But if you want to be selfishly in pursuit of personal liberty at the expense of others' interests, I can't stop you. Enjoy your freedom, play your part in any future flare-ups.