Following Cressi's patented Stop-Fog system the Naxos is the last entry-level with this innovative feature.  It is compact and smaller in size than a classic diving mask, but this unique feature does not reduce the field of vision, and thanks to new internal ribs, it adapts perfectly to any anatomy of the face. Naxos, like Quantum, not only offers increased downward vision but also avoids the phenomenon of fogging by thermoregulating the warm, moist air escaping from the nose inside the mask. This is channeled by a system of membranes in the mold around the eyes and nose, which deflect the flow toward the rubber walls and not toward the glass. On the outside of the walls is a cooling system consisting of two small heat exchangers that function like radiators. The effect is that the temperature inside the mask is lowered, bringing it closer to the outside temperature, and moisture droplets are trapped before the air reaches the glasses, thus preventing them from fogging up. The lenses are not chemically treated, so it should be remembered that when the mask is new, as is recommended for all masks, it is best to clean the lenses thoroughly with toothpaste, dishwashing detergent or simply use a lighter to burn off all volatiles and impurities deposited on the glass.