This product changed my life. My son found these watching a old season of shark tank. I have allergic asthma. I live in Florida so during the late winter when the pollen is coming off the oak trees I was confined to my bubble. I can now go out with my filters without the worry of an asthma attack.
I started with the large filters and moved on to the medium, they fit perfect. This is a great product. Follow the you tube video on shark tank if you are having difficulty applying them.