The Poseidon AtmoSphere Full Face Mask System is equipped with one of the world's highest performing regulators - the Poseidon Jetstream. The AtmoSphere is approved for freezing cold water, and features a unique highly effective de-fogging system which keeps the field of vision clear regardless of water temperature. As a positive pressure design, the full face mask also allows you to dive contaminated water without getting dirty water on your face. Any standard underwater voice communication system will fit the Poseidon mask.

The AtmoSphere FFM has a black silicone head strap with a clear polycarbonate visor. The head strap is a fully adjustable five point spider design and the mask has a double feathered edge face seal. The head strap adjustments and feathered edge seal combine to provide a perfect fit for nearly all divers. The sides of the visor are frosted to avoid distortion and reflections. Both the visor and head harness are easily user replaceable in the field.

The Poseidon Atmosphere FFM from Dive Gear Express includes the Atmosphere mask with Jetstream second stage and Xstream first stage, 29" rubber low-pressure hose, and accessories: anti-fog film, neck strap assembly, nameplate cover, and mask bag. Only the included Jetstream second stage regulator may be used with this mask and for optimum performance, we recommend the Atmosphere be connected to a Poseidon Xstream first stage.

The Poseidon Jetstream second stage uses pilot-operated upstream demand valve technology that seals the seat without the use of conventional knife edge design seating systems. This servo-assist feature allows for very low inhalation effort and also eliminates any need for an adjustment knob. The second stage is also ambidextrous, allowing both left and right hose routing (by reconfiguring the mask prior to diving) and breathes equally well in nearly any swimming position without free flowing while the side mounted exhaust directs the bubbles out of the field of vision.The Poseidon Jetstream second stage works at an intermediate pressure (IP) of { 123 psi | 8.5 bar } and like all upstream design regulators should only be used with a gas supply that has an over-pressure relief valve (OPV) incorporated within the first stage itself (like the Xstream first stage) or a specialized hose fitting.

The Xstream first stage uses a unique synthetic ruby sphere that virtually eliminates high pressure seat wear that is common in knife edge design seating systems. The Xstream first stage also uses a rolling diaphragm design that eliminates any restriction in movement, which creates a smooth transfer of gas from the first stage to the second stage. This rolling diaphragm design further creates a insulating barrier so there is no need for an additional environmental kit. The Xstream has five low pressure standard 3/8-inch UNF ports and two high pressure standard 7/16-inch UNF ports.

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