OXA Scuba Diving Snorkel Set including Dry Top Snorkel and Windows Tempered Glass Mask 1.Anti-fogging diving mask: The mask enables you to see underwater clearly by creating an air space between your eyes and water. Correctly using will give you good experience and protection. 2. Entirely dry breathing tube: The full dry snorkel is an innovative diving product which is becoming very popular around the world. When the snorkel submerges under water, the floating device in the flash guard will close automatically and no water will enter the tube. 3. Top safety : The Materials for the mouthpiece could be eaten, it is a perfect option for you regarding the security.