The Mares Ergo Snorkel was designed for maximum performance both for scuba divers and snorkelers alike. From one end to the other, the ergonomic shape fits perfectly to the side of the head, a contoured design for effortless breathing and efficient movement for greater comfort. The Hydrodynamic shape reduces drag both under and on the surface of the water. Snorkel comes with a corrugated flex lower tube made of high quality silicone which allows for any angle of use; the mouthpiece drops out of the way when not in use. During a dive will never be disturbed by the snorkel knocking against your regulator. It also features a snorkel keeper which can be adjusted in many positions. It also includes an exhaust valve in the mouthpiece for easy clearing. The mouthpiece is molded in soft rubber for greater shock and wear resistance, also to properly host the exhaust valve.