Transcript for Face mask reality check, which is the best option?
We are back now on "Gma" with the new face mask reality check. Wearing a face covering, we know, can help curb the spread of covid-19. Eva pilgrim has a new demonstration showing how 14 face coverings stacked up. Good morning, Eva. Reporter: Good morning, robin. This study looked at many popular styles we're seeing people wearing. Finding which ones work and what doesn't work as well so you can pick one that works for you. As masks become required in more and more places across the country scientists at duke put 14 commonly found options to the test. For testing we put our forehead against here. Reporter: They recorded video as a person spoke into a box housing a laser beam. This is what's under the Reporter: The goal, to see how effective different types of masks were at keeping droplets from getting out. Day five, surgical mask, trial one. Stay healthy. Reporter: You can see the green laser beam illuminating particles as the person spoke and can see the green droplets coming out of the mask into the box. This is the no mask. Reporter: Their results not all masks are created equal. Duke found the top performers to be the fitted n95 which have a sealed fit. Also the surgical mask and Cole pi cotton. The valved mask which was banned from several airlines in the middle of all 14 tested. It protects you, the wearer but it doesn't protect other people if by chance you have the disease and you don't know it. We were very surprised to see how many particles came out. Reporter: At the bottom, the bandanna and the popular and fashionable gaiter often found on runners. This one here is fleece, you see lots of little particles. Reporter: Duke found the fleece gaiter created more tiny droplets than speaking without a mask. Breaking down big droplets into multiple little droplets. And, of course, these little droplets could be problematic because they have an easier time being carried away by air. Reporter: When it comes to coronavirus we don't know what size droplet, big or small, make people sick or how many droplets it takes to infect you. What we do know and this experiment confirms most face covers cut down on the transmission of droplets. And we should point out moist of these masks were only tested once and researchers say their study was designed mainly to show how simple it is to test the masks. Our team of experts say the key to masks is pick one you will wear telling us repeatedly something is better than nothing. Robin. Something that you will wear. What's best for you. You got that right, Eva. Thank you. Thank you so much. For more on mask is best to help curb the spread of covid-19, you can visit our goodmorningamerica.com website. And coming up, we've got our
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