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The Poseidon Atmosphere fullface mask is equipped with one of the world ’s most high performing regulators -the Poseidon Jetstream. It is approved for cold water and in combination with the mask it features a unique highly effective de-fogging system which keeps the field of vision clear even at water temperatures close or equal to the freezing point.The mask has a no distorsion visor,with blasted sides to prevent reflexions. The mask has positive pressure breathing which is activated via a switch that can be easily reached even with thick gloves on.The positive pressure breathing system is a fail safe construction which if not activated will allow normal demand valve breathing.The mask can of course be used in all attitudes without free-flowing.