Review on Unigear Full Face Snorkel Mask - Panoramic 180° View with Advanced Safety Breathing System, Snorkel Set for Adults - Anti-Leak, Anti-Fog & Safe Breathing by Shree Carmean

We bought two and are very happy with them. My husband had a beard and it fits well and seals well. You dive down and it cuts off your air so water doesn't get in and you can breathe freely. I noticed that the second day I used mine mine was leaking and I felt like it was loose, that's really what you need to make sure you retighten the straps. I JUST FOUND AT OUR LOCAL DIVE SHOP that full face snorkels are banned in Hawaii because they are not designed for air exchange and your mask is designed to store carbon dioxide so they suggest we remove the mask every five minutes or the seal on the mask get up and go out into the fresh air