These filters add another layer of protection that makes me feel a bit more safe. They insert into all of my cloth masks easily and can be used multiple times. The only option I wish was available was a larger size so that with movement your mouth stays covered better. All in all, this is a really good product and I highly recommend for those who like wearing cloth masks.
You can actually breathe in them while remaining high ranked safe, I use it for travel and works great for indoor sports.