This is a Jet Flex/Purge Semi-Dry Snorkel. It features: Semi-Dry The upper valve gaurd stops splashes at the surface Silicone purge for effortless clearing and prevents water from seeping inside Flex for added comfort Silicone mouth piece for added comfort Easy to use snorkel keeper This Nice Jet Flex/Purge Semi-Drysnorkel is great for snorkeling and scuba diving. It combines modern technology with traditional concepts.