Where are all the Instructors on this one? Think folks ever hear of Archimedes? Unless the mask leaks from the top or your upside down how is the water going to get in even if it had a hole at the bottom! The vast majority of mask leaks are because of wrinkles or hair that prevents a good seal at the TOP of the mask allowing air to escape and be displaced by water coming from any non-sealed area. But if you hold the air in the water can't come in! Look at your buddy next time and you will see small bubbles coming from the top. So a Beard or Mustache has very little to do with it. Stop smiling or laughing and get a mask with a good skirt and fit and you will then have to let a little in once in a while to swish!