There's no better example of supremely solid first stage performance than the MK25. This air-balanced flow-through piston design provides consistent and effortless airflow regardless of depth, tank pressure, or breathing rate. And now, with the introduction of the new patent-pending Extended Thermal Insulating System (XTIS), the MK25 EVO lets you enjoy an ultra-fast breathing response, instant delivery of air on demand, great sensitivity and extra-high airflow - regardless of how cold the water is. The XTIS makes this possible by fully isolating the mechanical elements of the first stage from the cold, increasing its freezing resistance 30 percent over the current MK25 without compromising breathing performance. This makes theMK25 EVO the ultimate do-it-all first stage for all water temperatures.

The A700 second stage, with its metal casing, screw-down casing cover, metal valve housing and over-molded accents, exhibits a real muscularity in design. Its air-balanced valve technology and oversized exhaust valve work in conjunction with a well designed sectional exhaust tee, a first-rate purge and responsive user controls to create a bullet-proof breather with effortless inhalation and an ease of exhalation that is unmatched.

Add the Black Tech coating and you have a go-anywhere reg that's protected against the ravages of salt water and corrosion while maintaining a sleek scratch-resistance appearance that lasts. It's a proven combination that works as good as it looks.