I have an "indent" on the left side of my head due to childhood surgery. I would snorkel while holding my left hand against my mask to try to keep it sealed. (Picture me going in circles with only my right arm paddling - LOL). I have tried gluing pieces in masks, etc... In the end, I've given up. But, now that we're in the Keys most of the year, I really would love to find a mask that I could just wear and enjoy the sea again. I would volunteer for any testing you need. Thanks for working on this concept.