The Tiga Dry Snorkel from Sherwood uses the latest dry snorkel technologies to make sure it is easy to breath and no water enters your mouth. When snorkeling and you are underwater, a small valve closes and keeps the water out. When you return to the surface, you can count on the fact your mouth will fill with air and not water. The corrugated flex tube and removable, replaceable mouthpiece are made from 100% high quality silicone for comfort and fit.