The S270 features an air-balanced design patterned after the popular S620 Ti. Its compact casing and internal aerodynamics produce extremely low work of breathing. Designed to last in tough conditions, a fiberglass-reinforced nylon core combined with a PU outer layer result in a bulletproof anti-scratch casing. In addition to breathing performance, the S270 offers an effective purge and a dive/pre-dive switch. The exhaust tee is compact and efficient in minimising exhalation effort while directing bubbles out of the field of view.