The Enzo features an internal diameter designed for optimum flow rate and perfect for freediving and spearfishing. Snorkel has a low drag snag free design is made from durable materials with flex lower tube with upper tube contoured to hug the divers head for better hydrodynamics. Simple J-style design with no valves and a regular snorkel top. Snorkel has a quick-disconnect plastic snorkel keeper. Comfortable mouthpiece, all black in color makes the Oceanic Enzo Free Diving Snorkel the choice of serious free divers.