The Oceanic Aeris Dry Snorkel is a streamlined style that is perfect for snorkeling. The dry top feature is very responsive in closing off the breathing tube every time it drops below the waterline while in active use. The materials used are of the highest quality to ensure comfort and durability. Silicone is used in both the flex drop away tube and the replaceable mouthpiece. The Aeris Cuda also has a one way purge valve located at the bottom of the snorkel for easy initial clearing of any water prior to use.