Review (5/5): A must have addition to your mask
I use this product inside my surgical mask when exercising and under cloth masks when I am going to be talking. It keeps the mask from being sucked into my mouth. I teach water aerobics, and before I got this insert, I was miserable. Now I can breathe well and lead my classes without having mask fabric in my mouth. I regularly recommend this product to all my students. These particular inserts are cheap and do the job.