prevents the glasses from slipping off your nose. Some even help with wearing a face mask. My glasses don't fall off my masked face that often. The slight roughness of the silicone made the bridge of my nose a bit irritated when putting it on (the reason for the 4 stars), but I got used to it over the course of the day. I use plastic frames instead of wire noseplugs so I like that they hold my glasses in place better.
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