Keeps mask away from lips!  Other significant advantages, too.
Based on my background, I started wearing masks early in the pandemic.  While I had passion around doing so, I hated them rubbing against my lips:  annoying feel, when got damp and adhered to my lips was hard to breathe in (not a fantasy as I'd presumed), and made me sound like I was mumbling.  I don't wear lipstick but if I did it would be another big problem. Bought a rigid black plastic respirator-style device; sealed well and stayed away from lips but it was heavy and looked very industrial.  Kept looking and finally found these.  In my mind, pretty much perfect.  Acts like a frame, negligible weight, does not add to sensation of wearing a mask, invisible behind the mask, cleanable, and packet of 10 for only a few dollars.  Have been showing them to my friends, family, and even some store employees.
Rating: 5 stars