I was really annoyed by the masks I've been wearing. When I talked or took a deep breath the mask would suck in and make it harder to do either. During photo sessions that wasn't acceptable so I went down a YouTube rabbit hole watching mask makers in action, took what I liked from here and there, and made dozens of prototypes until I finally settled on this system and design. From cutting the fabric to inserting the elastic, it takes about 15 minutes to make one. I'm not an expert at sewing so my directions may be subpar but the photos should make it all clear. Help yourself and wear your new mask in good health!