Scubapro S270 Balanced OctopusScubapro S270 Octopus is tough, reliable, and easy to use. Its air balanced design can be counted on to deliver top notch breathing performance when you need it most. Air balanced valve smooths out the inhalation effort when diving at varying depths and supply pressures Lightweight casing, made of a fiberglass reinforced nylon core and a special PU outer layer, is extremely durable plus helps reduce jaw fatigue and improve diving comfort Technopolymer