Which Mask is Most Effective

recent study out of Duke University suggests that not all face coverings aid in the preventing the spread of Covid-19. 

While wearing a face mask or cloth covering when outside the home is one of the best things you can do to stay safe,  but  not all masks are as good at filtering potentially harmful coronavirus.

In experiments, bandanas, handkerchiefs, fleece balaclavas (cold-weather gear that covers the entire face except for the eyes) and neck gaiters (tubes of performance fabric typically used for running outdoors),offered very little protection, while N95 respirators, surgical masks and even homemade cloth masks performed better then the other mention above.

Reference: https://www.cnbc.com/2020/08/11/study-bandanas-and-neck-gaiters-not-effective-as-surgical-face-masks.html