Pick up an old snorkel with a removable mouthpiece, print this up and you're on your way to some awesome first person shots. It is breathable but I had to print in two pieces to get the proper angle. Just sand the two pieces and glue them together. I am very new at using cad software and this was just done in 123d. If you have suggestions I would be stoked and I can't wait to see if someone remixes this into something even better.Just print the two parts and sand the joining edges then super glue. I glued the mouthpiece on. Let me know if you discover any other tips but it is working great for me.