This Super Advanced Snorkel features: Stays dry! The upper valve gaurd stops splashes at the surface, and seals the tube while underwater Silicone purge for effortless clearing and prevents water from seeping inside. Flexible feature for added comfort, Silicone mouth piece for added comfort with easy to use snorkel keeper. This Fantastic Flex/Purge Drysnorkel is what you need if you are tired of breathing in that water that sneaks into your current Snorkel. Perfect for snorkeling or scuba diving!