Mares 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 Mares Prestige Octo is the most advanced medium-sized, high performance, technopolymer second stage available on the market. A mid-size octopus with a stylish design, strengthened by the ultimate technologies to grant steady, natural and effortless breathing. Easy-to-use soft purge diaphragm with mesh grid.