Machined titanium body is lightweight, highly resistant to corrosion and ultra-durable. Air balanced flow-through piston provides effortless airflow unaffected by depth, tank pressure, or breathing rate. Patented XTIS (Extended thermal Insulating system) thermally insulates the inner mechanism from the environment, improving cold-water resistance and delaying ice formation in extreme cold-water conditions without compromising breathing performance. Two opposing high pressure ports allow the first stage to be positioned either up or down. External intermediate pressure adjustment enables technicians to fine-tune performance quickly and easily. Air balanced valve smoothes out the inhalation effort at varying depths and supply pressures. User controls include an easy-grip diver-adjustable inhalation effort knob and Venturi-Initiated Vacuum Assist (VIVA) lever. Designed Compact Hi-Flow mouthpiece is mounted on an enlarged mouthpiece pipe to improve airflow as well as mouth comfort.