The new MK2 EVO comes with the patent-pending Extended Thermal Insulating System (XTIS) that lets you enjoy an ultra-fast breathing response and maximum airflow with minimal effort — 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 freezing resistance by an average of 50 percent over the current MK2. The MK2 EVO is also more compact than the standard MK2, yet has a bigger piston that pumps out 15 percent more airflow from a smaller package. So you can expect top-notch breathing performance whether you’re reef diving in the warm Caribbean or wreck diving in the chilly Great Lakes. The R095 is a modern second stage design based on the heritage of the time-honored R190. The R095 combines a classic downstream valve with a large diaphragm, functional purge button for smooth and easy operation. The MK2 EVO is the only downstream piston style first stage in its price range to offer systems and internal components specifically designed to resist freezing in extreme cold-water conditions. When teamed with the R095, this reg system is reliable, easy to maintain and even easier to use.