The Prestige is a mid-size octopus with a stylish design, strengthened by technology to give steady, natural and effortless breathing All Mares second stages are a reliable downstream valve design and offer the unique patented Vortex Assisted Design (VAD) system The air bypass tube conveys air to the mouthpiece creating a swirling vortex with a low pressure area in the center that keeps the diaphragm down during inhalation, for very sensitive and easy breathing at all depths The second stage cover features the new "mesh-grid" system for water inflow and outflow, which provides a further performance improvement The patented mesh design of the second stage cover reduces the pressure of water flowing onto the regulators diaphragm and minimizes free-flow Even in a strong current it eliminates the need for a knob to de-tune your air delivery system- advance technology through basic physics Furthermore, the compact and ergonomic exhaust tee ensures superior hydrodynamic performance and reduced exhalation resistance The mouthpiece is made of soft hypoallergenic silicone: limiting jaw fatigue and offering a secure fit even after very long dives Mares Octopus Prestige incorporates the Fluid Dynamic Deflector, developed after in-depth studies and tests of fluid dynamics, is engineered to receive and properly direct the airflow from the bypass tube to the mouthpiece Combined with the VAD system it delivers very natural and effortless breathing Octopus MV c